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                            [tor-browser/tor-browser-90.0b12-10.5-1] Bug 28125 - Prevent non-Necko network connections
                        
                        
by sysrqb@torproject.org 02 Jul '21
                    by sysrqb@torproject.org 02 Jul '21
02 Jul '21
                    
                        commit f8a05f64224583244f0a574c1586995fb7c282c2
Author: Matthew Finkel <Matthew.Finkel(a)gmail.com>
Date:   Thu Oct 25 19:17:09 2018 +0000
    Bug 28125 - Prevent non-Necko network connections
---
 .../gecko/media/GeckoMediaDrmBridgeV21.java        | 49 +---------------------
 .../exoplayer2/upstream/DefaultHttpDataSource.java | 47 ++-------------------
 2 files changed, 4 insertions(+), 92 deletions(-)
diff --git a/mobile/android/geckoview/src/main/java/org/mozilla/gecko/media/GeckoMediaDrmBridgeV21.java b/mobile/android/geckoview/src/main/java/org/mozilla/gecko/media/GeckoMediaDrmBridgeV21.java
index 6e75e6fb4dd5..7faa9bc2821d 100644
--- a/mobile/android/geckoview/src/main/java/org/mozilla/gecko/media/GeckoMediaDrmBridgeV21.java
+++ b/mobile/android/geckoview/src/main/java/org/mozilla/gecko/media/GeckoMediaDrmBridgeV21.java
@@ -490,54 +490,7 @@ public class GeckoMediaDrmBridgeV21 implements GeckoMediaDrm {
 
         @Override
         protected Void doInBackground(final Void... params) {
-            HttpURLConnection urlConnection = null;
-            BufferedReader in = null;
-            try {
-                final URI finalURI = new URI(mURL + "&signedRequest=" + URLEncoder.encode(new String(mDrmRequest), "UTF-8"));
-                urlConnection = (HttpURLConnection) ProxySelector.openConnectionWithProxy(finalURI);
-                urlConnection.setRequestMethod("POST");
-                if (DEBUG) Log.d(LOGTAG, "Provisioning, posting url =" + finalURI.toString());
-
-                // Add data
-                urlConnection.setRequestProperty("Accept", "*/*");
-                urlConnection.setRequestProperty("User-Agent", getCDMUserAgent());
-                urlConnection.setRequestProperty("Content-Type", "application/json");
-
-                // Execute HTTP Post Request
-                urlConnection.connect();
-
-                final int responseCode = urlConnection.getResponseCode();
-                if (responseCode == HttpURLConnection.HTTP_OK) {
-                    in = new BufferedReader(new InputStreamReader(urlConnection.getInputStream(), UTF_8));
-                    String inputLine;
-                    final StringBuffer response = new StringBuffer();
-
-                    while ((inputLine = in.readLine()) != null) {
-                        response.append(inputLine);
-                    }
-                    in.close();
-                    mResponseBody = String.valueOf(response).getBytes(UTF_8);
-                    if (DEBUG) Log.d(LOGTAG, "Provisioning, response received.");
-                    if (mResponseBody != null) Log.d(LOGTAG, "response length=" + mResponseBody.length);
-                } else {
-                    Log.d(LOGTAG, "Provisioning, server returned HTTP error code :" + responseCode);
-                }
-            } catch (final IOException e) {
-                Log.e(LOGTAG, "Got exception during posting provisioning request ...", e);
-            } catch (final URISyntaxException e) {
-                Log.e(LOGTAG, "Got exception during creating uri ...", e);
-            } finally {
-                if (urlConnection != null) {
-                    urlConnection.disconnect();
-                }
-                try {
-                    if (in != null) {
-                        in.close();
-                    }
-                } catch (final IOException e) {
-                    Log.e(LOGTAG, "Exception during closing in ...", e);
-                }
-            }
+            Log.i(LOGTAG, "This is Tor Browser. Skipping.");
             return null;
         }
 
diff --git a/mobile/android/geckoview/src/thirdparty/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/DefaultHttpDataSource.java b/mobile/android/geckoview/src/thirdparty/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/DefaultHttpDataSource.java
index 6e5095b0a4c9..a585e283ed4e 100644
--- a/mobile/android/geckoview/src/thirdparty/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/DefaultHttpDataSource.java
+++ b/mobile/android/geckoview/src/thirdparty/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/DefaultHttpDataSource.java
@@ -46,6 +46,7 @@ import java.util.regex.Pattern;
 import java.util.zip.GZIPInputStream;
 
 import org.mozilla.gecko.util.ProxySelector;
+
 /**
  * An {@link HttpDataSource} that uses Android's {@link HttpURLConnection}.
  *
@@ -516,50 +517,8 @@ public class DefaultHttpDataSource extends BaseDataSource implements HttpDataSou
       boolean followRedirects,
       Map<String, String> requestParameters)
       throws IOException, URISyntaxException {
-    /**
-     * Tor Project modified the way the connection object was created. For the sake of
-     * simplicity, instead of duplicating the whole file we changed the connection object
-     * to use the ProxySelector.
-     */
-    HttpURLConnection connection = (HttpURLConnection) ProxySelector.openConnectionWithProxy(url.toURI());
-
-    connection.setConnectTimeout(connectTimeoutMillis);
-    connection.setReadTimeout(readTimeoutMillis);
-
-    Map<String, String> requestHeaders = new HashMap<>();
-    if (defaultRequestProperties != null) {
-      requestHeaders.putAll(defaultRequestProperties.getSnapshot());
-    }
-    requestHeaders.putAll(requestProperties.getSnapshot());
-    requestHeaders.putAll(requestParameters);
-
-    for (Map.Entry<String, String> property : requestHeaders.entrySet()) {
-      connection.setRequestProperty(property.getKey(), property.getValue());
-    }
-
-    if (!(position == 0 && length == C.LENGTH_UNSET)) {
-      String rangeRequest = "bytes=" + position + "-";
-      if (length != C.LENGTH_UNSET) {
-        rangeRequest += (position + length - 1);
-      }
-      connection.setRequestProperty("Range", rangeRequest);
-    }
-    connection.setRequestProperty("User-Agent", userAgent);
-    connection.setRequestProperty("Accept-Encoding", allowGzip ? "gzip" : "identity");
-    connection.setInstanceFollowRedirects(followRedirects);
-    connection.setDoOutput(httpBody != null);
-    connection.setRequestMethod(DataSpec.getStringForHttpMethod(httpMethod));
-
-    if (httpBody != null) {
-      connection.setFixedLengthStreamingMode(httpBody.length);
-      connection.connect();
-      OutputStream os = connection.getOutputStream();
-      os.write(httpBody);
-      os.close();
-    } else {
-      connection.connect();
-    }
-    return connection;
+    Log.i(TAG, "This is Tor Browser. Skipping.");
+    throw new IOException();
   }
 
   /** Creates an {@link HttpURLConnection} that is connected with the {@code url}. */
                    
                  
                  
                          
                            
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                            [tor-browser/tor-browser-90.0b12-10.5-1] Orfox: Centralized proxy applied to AbstractCommunicator and BaseResources.
                        
                        
by sysrqb@torproject.org 02 Jul '21
                    by sysrqb@torproject.org 02 Jul '21
02 Jul '21
                    
                        commit 7354cfaccd8cabba9daa93126ece4543d03247cb
Author: Amogh Pradeep <amoghbl1(a)gmail.com>
Date:   Fri Jun 12 02:07:45 2015 -0400
    Orfox: Centralized proxy applied to AbstractCommunicator and BaseResources.
    
    See Bug 1357997 for partial uplift.
    
    Also:
    Bug 28051 - Use our Orbot for proxying our connections
    
    Bug 31144 - ESR68 Network Code Review
---
 .../java/org/mozilla/gecko/util/ProxySelector.java | 25 +++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)
diff --git a/mobile/android/geckoview/src/main/java/org/mozilla/gecko/util/ProxySelector.java b/mobile/android/geckoview/src/main/java/org/mozilla/gecko/util/ProxySelector.java
index dbd07a069de1..800c7cf96de8 100644
--- a/mobile/android/geckoview/src/main/java/org/mozilla/gecko/util/ProxySelector.java
+++ b/mobile/android/geckoview/src/main/java/org/mozilla/gecko/util/ProxySelector.java
@@ -29,6 +29,10 @@ import java.net.URLConnection;
 import java.util.List;
 
 public class ProxySelector {
+    private static final String TOR_PROXY_ADDRESS = "127.0.0.1";
+    private static final int TOR_SOCKS_PROXY_PORT = 9150;
+    private static final int TOR_HTTP_PROXY_PORT = 8218;
+
     public static URLConnection openConnectionWithProxy(final URI uri) throws IOException {
         final java.net.ProxySelector ps = java.net.ProxySelector.getDefault();
         Proxy proxy = Proxy.NO_PROXY;
@@ -39,7 +43,26 @@ public class ProxySelector {
             }
         }
 
-        return uri.toURL().openConnection(proxy);
+        /* Ignore the proxy we found from the VM, only use Tor. We can probably
+         * safely use the logic in this class in the future. */
+        return uri.toURL().openConnection(getProxy());
+    }
+
+    public static Proxy getProxy() {
+        // TODO make configurable
+        return new Proxy(Proxy.Type.SOCKS, new InetSocketAddress(TOR_PROXY_ADDRESS, TOR_SOCKS_PROXY_PORT));
+    }
+
+    public static String getProxyHostAddress() {
+        return TOR_PROXY_ADDRESS;
+    }
+
+    public static int getSocksProxyPort() {
+        return TOR_SOCKS_PROXY_PORT;
+    }
+
+    public static int getHttpProxyPort() {
+        return TOR_HTTP_PROXY_PORT;
     }
 
     public ProxySelector() {
                    
                  
                  
                          
                            
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                            [tor-browser/tor-browser-90.0b12-10.5-1] Bug 33342: Avoid disconnect search addon error after removal.
                        
                        
by sysrqb@torproject.org 02 Jul '21
                    by sysrqb@torproject.org 02 Jul '21
02 Jul '21
                    
                        commit 83bb34ac32b22bf60f65a1a09994edc01829e811
Author: Alex Catarineu <acat(a)torproject.org>
Date:   Fri Mar 13 18:19:30 2020 +0100
    Bug 33342: Avoid disconnect search addon error after removal.
    
    We removed the addon in #32767, but it was still being loaded
    from addonStartup.json.lz4 and throwing an error on startup
    because its resource: location is not available anymore.
---
 toolkit/mozapps/extensions/internal/XPIProvider.jsm | 6 ++++++
 1 file changed, 6 insertions(+)
diff --git a/toolkit/mozapps/extensions/internal/XPIProvider.jsm b/toolkit/mozapps/extensions/internal/XPIProvider.jsm
index 939dd6a70b24..ddf6f0049054 100644
--- a/toolkit/mozapps/extensions/internal/XPIProvider.jsm
+++ b/toolkit/mozapps/extensions/internal/XPIProvider.jsm
@@ -959,6 +959,12 @@ var BuiltInLocation = new (class _BuiltInLocation extends XPIStateLocation {
   isLinkedAddon(/* aId */) {
     return false;
   }
+
+  restore(saved) {
+    super.restore(saved);
+    // Bug 33342: avoid restoring disconnect addon from addonStartup.json.lz4.
+    this.removeAddon("disconnect(a)search.mozilla.org");
+  }
 })();
 
 /**
                    
                  
                  
                          
                            
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                            [tor-browser/tor-browser-90.0b12-10.5-1] Bug 28005: Implement .onion alias urlbar rewrites
                        
                        
by sysrqb@torproject.org 02 Jul '21
                    by sysrqb@torproject.org 02 Jul '21
02 Jul '21
                    
                        commit e7238b08ea167aab89b335c1f775690df02daaf6
Author: Alex Catarineu <acat(a)torproject.org>
Date:   Thu Feb 13 13:24:33 2020 +0100
    Bug 28005: Implement .onion alias urlbar rewrites
    
    A custom HTTPS Everywhere update channel is installed,
    which provides rules for locally redirecting some memorable
    .tor.onion URLs to non-memorable .onion URLs.
    
    When these redirects occur, we also rewrite the URL in the urlbar
    to display the human-memorable hostname instead of the actual
    .onion.
    
    Bug 34196: Update site info URL with the onion name
---
 browser/actors/ClickHandlerChild.jsm               |  20 ++
 browser/actors/ClickHandlerParent.jsm              |   1 +
 browser/actors/ContextMenuChild.jsm                |   4 +
 browser/base/content/browser-places.js             |  12 +-
 browser/base/content/browser-siteIdentity.js       |  12 +-
 browser/base/content/browser.js                    |  43 ++++-
 browser/base/content/nsContextMenu.js              |  18 ++
 browser/base/content/pageinfo/pageInfo.js          |   2 +-
 browser/base/content/pageinfo/pageInfo.xhtml       |  10 +
 browser/base/content/pageinfo/security.js          |  17 +-
 browser/base/content/tabbrowser.js                 |   7 +
 browser/base/content/utilityOverlay.js             |  12 ++
 browser/components/BrowserGlue.jsm                 |   8 +
 .../onionservices/ExtensionMessaging.jsm           |  77 ++++++++
 .../onionservices/HttpsEverywhereControl.jsm       | 119 ++++++++++++
 .../components/onionservices/OnionAliasStore.jsm   | 201 +++++++++++++++++++++
 browser/components/onionservices/moz.build         |   6 +
 browser/components/urlbar/UrlbarInput.jsm          |  13 +-
 docshell/base/nsDocShell.cpp                       |  52 ++++++
 docshell/base/nsDocShell.h                         |   6 +
 docshell/base/nsDocShellLoadState.cpp              |   8 +
 docshell/base/nsIDocShell.idl                      |   5 +
 docshell/base/nsIWebNavigation.idl                 |   5 +
 docshell/shistory/SessionHistoryEntry.cpp          |  14 ++
 docshell/shistory/SessionHistoryEntry.h            |   1 +
 docshell/shistory/nsISHEntry.idl                   |   5 +
 docshell/shistory/nsSHEntry.cpp                    |  22 ++-
 docshell/shistory/nsSHEntry.h                      |   1 +
 dom/interfaces/base/nsIBrowser.idl                 |   3 +-
 dom/ipc/BrowserChild.cpp                           |   2 +
 dom/ipc/BrowserParent.cpp                          |   3 +-
 dom/ipc/PBrowser.ipdl                              |   1 +
 modules/libpref/init/StaticPrefList.yaml           |   6 +
 netwerk/dns/effective_tld_names.dat                |   2 +
 netwerk/ipc/DocumentLoadListener.cpp               |  10 +
 toolkit/content/widgets/browser-custom-element.js  |  13 +-
 toolkit/modules/sessionstore/SessionHistory.jsm    |   5 +
 xpcom/reflect/xptinfo/xptinfo.h                    |   3 +-
 38 files changed, 726 insertions(+), 23 deletions(-)
diff --git a/browser/actors/ClickHandlerChild.jsm b/browser/actors/ClickHandlerChild.jsm
index 4f5c2b0b7ea1..3ba2f11bf362 100644
--- a/browser/actors/ClickHandlerChild.jsm
+++ b/browser/actors/ClickHandlerChild.jsm
@@ -114,6 +114,26 @@ class ClickHandlerChild extends JSWindowActorChild {
       json.originStoragePrincipal = ownerDoc.effectiveStoragePrincipal;
       json.triggeringPrincipal = ownerDoc.nodePrincipal;
 
+      // Check if the link needs to be opened with .tor.onion urlbar rewrites
+      // allowed. Only when the owner doc has onionUrlbarRewritesAllowed = true
+      // and the same origin we should allow this.
+      json.onionUrlbarRewritesAllowed = false;
+      if (this.docShell.onionUrlbarRewritesAllowed) {
+        const sm = Services.scriptSecurityManager;
+        try {
+          let targetURI = Services.io.newURI(href);
+          let isPrivateWin =
+            ownerDoc.nodePrincipal.originAttributes.privateBrowsingId > 0;
+          sm.checkSameOriginURI(
+            docshell.currentDocumentChannel.URI,
+            targetURI,
+            false,
+            isPrivateWin
+          );
+          json.onionUrlbarRewritesAllowed = true;
+        } catch (e) {}
+      }
+
       // If a link element is clicked with middle button, user wants to open
       // the link somewhere rather than pasting clipboard content.  Therefore,
       // when it's clicked with middle button, we should prevent multiple
diff --git a/browser/actors/ClickHandlerParent.jsm b/browser/actors/ClickHandlerParent.jsm
index 0f658fccf7b8..ad8f6c2a27e2 100644
--- a/browser/actors/ClickHandlerParent.jsm
+++ b/browser/actors/ClickHandlerParent.jsm
@@ -98,6 +98,7 @@ class ClickHandlerParent extends JSWindowActorParent {
     let params = {
       charset: browser.characterSet,
       referrerInfo: E10SUtils.deserializeReferrerInfo(data.referrerInfo),
+      onionUrlbarRewritesAllowed: data.onionUrlbarRewritesAllowed,
       isContentWindowPrivate: data.isContentWindowPrivate,
       originPrincipal: data.originPrincipal,
       originStoragePrincipal: data.originStoragePrincipal,
diff --git a/browser/actors/ContextMenuChild.jsm b/browser/actors/ContextMenuChild.jsm
index a286eafe0f6d..d332cb41acc8 100644
--- a/browser/actors/ContextMenuChild.jsm
+++ b/browser/actors/ContextMenuChild.jsm
@@ -545,6 +545,9 @@ class ContextMenuChild extends JSWindowActorChild {
       doc.defaultView
     ).getFieldContext(aEvent.composedTarget);
 
+    let parentAllowsOnionUrlbarRewrites = this.docShell
+      .onionUrlbarRewritesAllowed;
+
     let disableSetDesktopBackground = null;
 
     // Media related cache info parent needs for saving
@@ -656,6 +659,7 @@ class ContextMenuChild extends JSWindowActorChild {
       frameID,
       frameBrowsingContextID,
       disableSetDesktopBackground,
+      parentAllowsOnionUrlbarRewrites,
     };
 
     if (context.inFrame && !context.inSrcdocFrame) {
diff --git a/browser/base/content/browser-places.js b/browser/base/content/browser-places.js
index a73e2090bbee..cb8fbeab9bf4 100644
--- a/browser/base/content/browser-places.js
+++ b/browser/base/content/browser-places.js
@@ -470,7 +470,8 @@ var PlacesCommandHook = {
    */
   async bookmarkPage() {
     let browser = gBrowser.selectedBrowser;
-    let url = new URL(browser.currentURI.spec);
+    const uri = browser.currentOnionAliasURI || browser.currentURI;
+    let url = new URL(uri.spec);
     let info = await PlacesUtils.bookmarks.fetch({ url });
     let isNewBookmark = !info;
     let showEditUI = !isNewBookmark || StarUI.showForNewBookmarks;
@@ -581,7 +582,7 @@ var PlacesCommandHook = {
 
     tabs.forEach(tab => {
       let browser = tab.linkedBrowser;
-      let uri = browser.currentURI;
+      let uri = browser.currentOnionAliasURI || browser.currentURI;
       let title = browser.contentTitle || tab.label;
       let spec = uri.spec;
       if (!(spec in uniquePages)) {
@@ -1828,14 +1829,17 @@ var BookmarkingUI = {
   },
 
   onLocationChange: function BUI_onLocationChange() {
-    if (this._uri && gBrowser.currentURI.equals(this._uri)) {
+    const uri =
+      gBrowser.selectedBrowser.currentOnionAliasURI || gBrowser.currentURI;
+    if (this._uri && uri.equals(this._uri)) {
       return;
     }
     this.updateStarState();
   },
 
   updateStarState: function BUI_updateStarState() {
-    this._uri = gBrowser.currentURI;
+    this._uri =
+      gBrowser.selectedBrowser.currentOnionAliasURI || gBrowser.currentURI;
     this._itemGuids.clear();
     let guids = new Set();
 
diff --git a/browser/base/content/browser-siteIdentity.js b/browser/base/content/browser-siteIdentity.js
index 7c9a91ed5af1..7c132668f6b4 100644
--- a/browser/base/content/browser-siteIdentity.js
+++ b/browser/base/content/browser-siteIdentity.js
@@ -658,13 +658,13 @@ var gIdentityHandler = {
    *        nsIURI for which the identity UI should be displayed, already
    *        processed by createExposableURI.
    */
-  updateIdentity(state, uri) {
+  updateIdentity(state, uri, onionAliasURI) {
     let shouldHidePopup = this._uri && this._uri.spec != uri.spec;
     this._state = state;
 
     // Firstly, populate the state properties required to display the UI. See
     // the documentation of the individual properties for details.
-    this.setURI(uri);
+    this.setURI(uri, onionAliasURI);
     this._secInfo = gBrowser.securityUI.secInfo;
     this._isSecureContext = gBrowser.securityUI.isSecureContext;
 
@@ -687,17 +687,18 @@ var gIdentityHandler = {
    * Attempt to provide proper IDN treatment for host names
    */
   getEffectiveHost() {
+    let uri = this._onionAliasURI || this._uri;
     if (!this._IDNService) {
       this._IDNService = Cc["@mozilla.org/network/idn-service;1"].getService(
         Ci.nsIIDNService
       );
     }
     try {
-      return this._IDNService.convertToDisplayIDN(this._uri.host, {});
+      return this._IDNService.convertToDisplayIDN(uri.host, {});
     } catch (e) {
       // If something goes wrong (e.g. host is an IP address) just fail back
       // to the full domain.
-      return this._uri.host;
+      return uri.host;
     }
   },
 
@@ -1140,11 +1141,12 @@ var gIdentityHandler = {
     this._identityPopupContentVerif.textContent = verifier;
   },
 
-  setURI(uri) {
+  setURI(uri, onionAliasURI) {
     if (uri.schemeIs("view-source")) {
       uri = Services.io.newURI(uri.spec.replace(/^view-source:/i, ""));
     }
     this._uri = uri;
+    this._onionAliasURI = onionAliasURI;
 
     try {
       // Account for file: urls and catch when "" is the value
diff --git a/browser/base/content/browser.js b/browser/base/content/browser.js
index 501519db864e..7103cd2c374b 100644
--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -82,6 +82,7 @@ XPCOMUtils.defineLazyModuleGetters(this, {
   TabCrashHandler: "resource:///modules/ContentCrashHandlers.jsm",
   TelemetryEnvironment: "resource://gre/modules/TelemetryEnvironment.jsm",
   Translation: "resource:///modules/translation/TranslationParent.jsm",
+  OnionAliasStore: "resource:///modules/OnionAliasStore.jsm",
   UITour: "resource:///modules/UITour.jsm",
   UpdateUtils: "resource://gre/modules/UpdateUtils.jsm",
   UrlbarInput: "resource:///modules/UrlbarInput.jsm",
@@ -2286,6 +2287,7 @@ var gBrowserInit = {
         //                 [9]: allowInheritPrincipal (bool)
         //                 [10]: csp (nsIContentSecurityPolicy)
         //                 [11]: nsOpenWindowInfo
+        //                 [12]: onionUrlbarRewritesAllowed (bool)
         let userContextId =
           window.arguments[5] != undefined
             ? window.arguments[5]
@@ -2305,7 +2307,8 @@ var gBrowserInit = {
           // TODO fix allowInheritPrincipal to default to false.
           // Default to true unless explicitly set to false because of bug 1475201.
           window.arguments[9] !== false,
-          window.arguments[10]
+          window.arguments[10],
+          window.arguments[12]
         );
         window.focus();
       } else {
@@ -3085,7 +3088,8 @@ function loadURI(
   forceAboutBlankViewerInCurrent,
   triggeringPrincipal,
   allowInheritPrincipal = false,
-  csp = null
+  csp = null,
+  onionUrlbarRewritesAllowed = false
 ) {
   if (!triggeringPrincipal) {
     throw new Error("Must load with a triggering Principal");
@@ -3103,6 +3107,7 @@ function loadURI(
       csp,
       forceAboutBlankViewerInCurrent,
       allowInheritPrincipal,
+      onionUrlbarRewritesAllowed,
     });
   } catch (e) {
     Cu.reportError(e);
@@ -5227,11 +5232,24 @@ var XULBrowserWindow = {
       this.reloadCommand.removeAttribute("disabled");
     }
 
+    // The onion memorable alias needs to be used in gURLBar.setURI, but also in
+    // other parts of the code (like the bookmarks UI), so we save it.
+    if (gBrowser.selectedBrowser.onionUrlbarRewritesAllowed) {
+      gBrowser.selectedBrowser.currentOnionAliasURI = OnionAliasStore.getShortURI(
+        aLocationURI
+      );
+    } else {
+      gBrowser.selectedBrowser.currentOnionAliasURI = null;
+    }
+
     // We want to update the popup visibility if we received this notification
     // via simulated locationchange events such as switching between tabs, however
     // if this is a document navigation then PopupNotifications will be updated
     // via TabsProgressListener.onLocationChange and we do not want it called twice
-    gURLBar.setURI(aLocationURI, aIsSimulated);
+    gURLBar.setURI(
+      gBrowser.selectedBrowser.currentOnionAliasURI || aLocationURI,
+      aIsSimulated
+    );
 
     BookmarkingUI.onLocationChange();
     // If we've actually changed document, update the toolbar visibility.
@@ -5426,6 +5444,7 @@ var XULBrowserWindow = {
     // Don't need to do anything if the data we use to update the UI hasn't
     // changed
     let uri = gBrowser.currentURI;
+    let onionAliasURI = gBrowser.selectedBrowser.currentOnionAliasURI;
     let spec = uri.spec;
     let isSecureContext = gBrowser.securityUI.isSecureContext;
     if (
@@ -5449,7 +5468,7 @@ var XULBrowserWindow = {
     try {
       uri = Services.io.createExposableURI(uri);
     } catch (e) {}
-    gIdentityHandler.updateIdentity(this._state, uri);
+    gIdentityHandler.updateIdentity(this._state, uri, onionAliasURI);
   },
 
   // simulate all change notifications after switching tabs
@@ -6956,6 +6975,21 @@ function handleLinkClick(event, href, linkNode) {
     return true;
   }
 
+  // Check if the link needs to be opened with .tor.onion urlbar rewrites
+  // allowed. Only when the owner doc has onionUrlbarRewritesAllowed = true
+  // and the same origin we should allow this.
+  let persistOnionUrlbarRewritesAllowedInChildTab = false;
+  if (where == "tab" && gBrowser.docShell.onionUrlbarRewritesAllowed) {
+    const sm = Services.scriptSecurityManager;
+    try {
+      let tURI = makeURI(href);
+      let isPrivateWin =
+        doc.nodePrincipal.originAttributes.privateBrowsingId > 0;
+      sm.checkSameOriginURI(doc.documentURIObject, tURI, false, isPrivateWin);
+      persistOnionUrlbarRewritesAllowedInChildTab = true;
+    } catch (e) {}
+  }
+
   let frameID = WebNavigationFrames.getFrameId(doc.defaultView);
 
   urlSecurityCheck(href, doc.nodePrincipal);
@@ -6967,6 +7001,7 @@ function handleLinkClick(event, href, linkNode) {
     triggeringPrincipal: doc.nodePrincipal,
     csp: doc.csp,
     frameID,
+    onionUrlbarRewritesAllowed: persistOnionUrlbarRewritesAllowedInChildTab,
   };
 
   // The new tab/window must use the same userContextId
diff --git a/browser/base/content/nsContextMenu.js b/browser/base/content/nsContextMenu.js
index f84f5fb7d028..c6b1257e45be 100644
--- a/browser/base/content/nsContextMenu.js
+++ b/browser/base/content/nsContextMenu.js
@@ -57,6 +57,7 @@ function openContextMenu(aMessage, aBrowser, aActor) {
     selectionInfo: data.selectionInfo,
     disableSetDesktopBackground: data.disableSetDesktopBackground,
     loginFillInfo: data.loginFillInfo,
+    parentAllowsOnionUrlbarRewrites: data.parentAllowsOnionUrlbarRewrites,
     userContextId: data.userContextId,
     webExtContextData: data.webExtContextData,
     cookieJarSettings: E10SUtils.deserializeCookieJarSettings(
@@ -1195,6 +1196,7 @@ class nsContextMenu {
       triggeringPrincipal: this.principal,
       csp: this.csp,
       frameID: this.contentData.frameID,
+      onionUrlbarRewritesAllowed: false,
     };
     for (let p in extra) {
       params[p] = extra[p];
@@ -1218,6 +1220,22 @@ class nsContextMenu {
     }
 
     params.referrerInfo = referrerInfo;
+
+    // Check if the link needs to be opened with .tor.onion urlbar rewrites
+    // allowed. Only when parent has onionUrlbarRewritesAllowed = true
+    // and the same origin we should allow this.
+    if (this.contentData.parentAllowsOnionUrlbarRewrites) {
+      let referrerURI = this.contentData.documentURIObject;
+      const sm = Services.scriptSecurityManager;
+      try {
+        let targetURI = this.linkURI;
+        let isPrivateWin =
+          this.browser.contentPrincipal.originAttributes.privateBrowsingId > 0;
+        sm.checkSameOriginURI(referrerURI, targetURI, false, isPrivateWin);
+        params.onionUrlbarRewritesAllowed = true;
+      } catch (e) {}
+    }
+
     return params;
   }
 
diff --git a/browser/base/content/pageinfo/pageInfo.js b/browser/base/content/pageinfo/pageInfo.js
index f63ee0a457e1..ae152f97f7b3 100644
--- a/browser/base/content/pageinfo/pageInfo.js
+++ b/browser/base/content/pageinfo/pageInfo.js
@@ -398,7 +398,7 @@ async function onNonMediaPageInfoLoad(browser, pageInfoData, imageInfo) {
     );
   }
   onLoadPermission(uri, principal);
-  securityOnLoad(uri, windowInfo);
+  securityOnLoad(uri, windowInfo, browser.currentOnionAliasURI);
 }
 
 function resetPageInfo(args) {
diff --git a/browser/base/content/pageinfo/pageInfo.xhtml b/browser/base/content/pageinfo/pageInfo.xhtml
index f40ffd3778d8..a23f2bb5748c 100644
--- a/browser/base/content/pageinfo/pageInfo.xhtml
+++ b/browser/base/content/pageinfo/pageInfo.xhtml
@@ -312,6 +312,16 @@
               <input id="security-identity-domain-value" readonly="readonly"/>
             </td>
           </tr>
+          <!-- Onion Alias -->
+          <tr id="security-view-identity-onionalias-row">
+            <th>
+              <xul:label id="security-view-identity-onionalias"
+                     control="security-view-identity-onionalias-value"/>
+            </th>
+            <td>
+              <input id="security-view-identity-onionalias-value" readonly="true"/>
+            </td>
+          </tr>
           <!-- Owner -->
           <tr>
             <th>
diff --git a/browser/base/content/pageinfo/security.js b/browser/base/content/pageinfo/security.js
index 192e9f763700..7693a0304823 100644
--- a/browser/base/content/pageinfo/security.js
+++ b/browser/base/content/pageinfo/security.js
@@ -249,7 +249,7 @@ var security = {
   },
 };
 
-async function securityOnLoad(uri, windowInfo) {
+async function securityOnLoad(uri, windowInfo, onionAliasURI) {
   await security.init(uri, windowInfo);
 
   let info = security.securityInfo;
@@ -262,6 +262,21 @@ async function securityOnLoad(uri, windowInfo) {
   }
   document.getElementById("securityTab").hidden = false;
 
+  if (onionAliasURI) {
+    setText(
+      "security-view-identity-onionalias",
+      gTorButtonBundle.GetStringFromName("pageInfo_OnionName")
+    );
+    setText("security-view-identity-onionalias-value", onionAliasURI.host);
+    document.getElementById(
+      "security-view-identity-onionalias-row"
+    ).hidden = false;
+  } else {
+    document.getElementById(
+      "security-view-identity-onionalias-row"
+    ).hidden = true;
+  }
+
   /* Set Identity section text */
   setText("security-identity-domain-value", windowInfo.hostName);
 
diff --git a/browser/base/content/tabbrowser.js b/browser/base/content/tabbrowser.js
index 0081810bd43e..d1457a6638b7 100644
--- a/browser/base/content/tabbrowser.js
+++ b/browser/base/content/tabbrowser.js
@@ -1647,6 +1647,7 @@
       var aFromExternal;
       var aRelatedToCurrent;
       var aAllowInheritPrincipal;
+      var aOnionUrlbarRewritesAllowed;
       var aSkipAnimation;
       var aForceNotRemote;
       var aPreferredRemoteType;
@@ -1676,6 +1677,7 @@
         aFromExternal = params.fromExternal;
         aRelatedToCurrent = params.relatedToCurrent;
         aAllowInheritPrincipal = !!params.allowInheritPrincipal;
+        aOnionUrlbarRewritesAllowed = params.onionUrlbarRewritesAllowed;
         aSkipAnimation = params.skipAnimation;
         aForceNotRemote = params.forceNotRemote;
         aPreferredRemoteType = params.preferredRemoteType;
@@ -1716,6 +1718,7 @@
         fromExternal: aFromExternal,
         relatedToCurrent: aRelatedToCurrent,
         skipAnimation: aSkipAnimation,
+        onionUrlbarRewritesAllowed: aOnionUrlbarRewritesAllowed,
         forceNotRemote: aForceNotRemote,
         createLazyBrowser: aCreateLazyBrowser,
         preferredRemoteType: aPreferredRemoteType,
@@ -2548,6 +2551,7 @@
       aURI,
       {
         allowInheritPrincipal,
+        onionUrlbarRewritesAllowed,
         allowThirdPartyFixup,
         bulkOrderedOpen,
         charset,
@@ -2888,6 +2892,9 @@
             // lands.
             flags |= Ci.nsIWebNavigation.LOAD_FLAGS_FIRST_LOAD;
           }
+          if (onionUrlbarRewritesAllowed) {
+            flags |= Ci.nsIWebNavigation.LOAD_FLAGS_ALLOW_ONION_URLBAR_REWRITES;
+          }
           if (!allowInheritPrincipal) {
             flags |= Ci.nsIWebNavigation.LOAD_FLAGS_DISALLOW_INHERIT_PRINCIPAL;
           }
diff --git a/browser/base/content/utilityOverlay.js b/browser/base/content/utilityOverlay.js
index 78eb18a203fd..342a92a766a4 100644
--- a/browser/base/content/utilityOverlay.js
+++ b/browser/base/content/utilityOverlay.js
@@ -367,6 +367,7 @@ function openLinkIn(url, where, params) {
     : new ReferrerInfo(Ci.nsIReferrerInfo.EMPTY, true, null);
   var aRelatedToCurrent = params.relatedToCurrent;
   var aAllowInheritPrincipal = !!params.allowInheritPrincipal;
+  var aOnionUrlbarRewritesAllowed = params.onionUrlbarRewritesAllowed;
   var aForceAllowDataURI = params.forceAllowDataURI;
   var aInBackground = params.inBackground;
   var aInitiatingDoc = params.initiatingDoc;
@@ -483,6 +484,11 @@ function openLinkIn(url, where, params) {
     ].createInstance(Ci.nsISupportsPRBool);
     allowThirdPartyFixupSupports.data = aAllowThirdPartyFixup;
 
+    var onionUrlbarRewritesAllowed = Cc[
+      "@mozilla.org/supports-PRBool;1"
+    ].createInstance(Ci.nsISupportsPRBool);
+    onionUrlbarRewritesAllowed.data = aOnionUrlbarRewritesAllowed;
+
     var userContextIdSupports = Cc[
       "@mozilla.org/supports-PRUint32;1"
     ].createInstance(Ci.nsISupportsPRUint32);
@@ -499,6 +505,8 @@ function openLinkIn(url, where, params) {
     sa.appendElement(aTriggeringPrincipal);
     sa.appendElement(null); // allowInheritPrincipal
     sa.appendElement(aCsp);
+    sa.appendElement(null); // nsOpenWindowInfo
+    sa.appendElement(onionUrlbarRewritesAllowed);
 
     const sourceWindow = w || window;
     let win;
@@ -616,6 +624,9 @@ function openLinkIn(url, where, params) {
       if (aForceAllowDataURI) {
         flags |= Ci.nsIWebNavigation.LOAD_FLAGS_FORCE_ALLOW_DATA_URI;
       }
+      if (aOnionUrlbarRewritesAllowed) {
+        flags |= Ci.nsIWebNavigation.LOAD_FLAGS_ALLOW_ONION_URLBAR_REWRITES;
+      }
 
       let { URI_INHERITS_SECURITY_CONTEXT } = Ci.nsIProtocolHandler;
       if (
@@ -662,6 +673,7 @@ function openLinkIn(url, where, params) {
         allowThirdPartyFixup: aAllowThirdPartyFixup,
         relatedToCurrent: aRelatedToCurrent,
         skipAnimation: aSkipTabAnimation,
+        onionUrlbarRewritesAllowed: aOnionUrlbarRewritesAllowed,
         userContextId: aUserContextId,
         originPrincipal: aPrincipal,
         originStoragePrincipal: aStoragePrincipal,
diff --git a/browser/components/BrowserGlue.jsm b/browser/components/BrowserGlue.jsm
index 6186479ac306..5b320bd989f0 100644
--- a/browser/components/BrowserGlue.jsm
+++ b/browser/components/BrowserGlue.jsm
@@ -86,6 +86,7 @@ XPCOMUtils.defineLazyModuleGetters(this, {
   TabUnloader: "resource:///modules/TabUnloader.jsm",
   TelemetryUtils: "resource://gre/modules/TelemetryUtils.jsm",
   TRRRacer: "resource:///modules/TRRPerformance.jsm",
+  OnionAliasStore: "resource:///modules/OnionAliasStore.jsm",
   UIState: "resource://services-sync/UIState.jsm",
   UrlbarQuickSuggest: "resource:///modules/UrlbarQuickSuggest.jsm",
   UrlbarPrefs: "resource:///modules/UrlbarPrefs.jsm",
@@ -1933,6 +1934,7 @@ BrowserGlue.prototype = {
     Normandy.uninit();
     RFPHelper.uninit();
     ASRouterNewTabHook.destroy();
+    OnionAliasStore.uninit();
   },
 
   // Set up a listener to enable/disable the screenshots extension
@@ -2422,6 +2424,12 @@ BrowserGlue.prototype = {
         },
       },
 
+      {
+        task: () => {
+          OnionAliasStore.init();
+        },
+      },
+
       {
         task: () => {
           Blocklist.loadBlocklistAsync();
diff --git a/browser/components/onionservices/ExtensionMessaging.jsm b/browser/components/onionservices/ExtensionMessaging.jsm
new file mode 100644
index 000000000000..c93b8c6edf85
--- /dev/null
+++ b/browser/components/onionservices/ExtensionMessaging.jsm
@@ -0,0 +1,77 @@
+// Copyright (c) 2020, The Tor Project, Inc.
+
+"use strict";
+
+const EXPORTED_SYMBOLS = ["ExtensionMessaging"];
+
+const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
+const { ExtensionUtils } = ChromeUtils.import(
+  "resource://gre/modules/ExtensionUtils.jsm"
+);
+const { MessageChannel } = ChromeUtils.import(
+  "resource://gre/modules/MessageChannel.jsm"
+);
+const { AddonManager } = ChromeUtils.import(
+  "resource://gre/modules/AddonManager.jsm"
+);
+
+const { XPCOMUtils } = ChromeUtils.import(
+  "resource://gre/modules/XPCOMUtils.jsm"
+);
+
+XPCOMUtils.defineLazyModuleGetters(this, {
+  ExtensionParent: "resource://gre/modules/ExtensionParent.jsm",
+});
+
+class ExtensionMessaging {
+  constructor() {
+    this._callback = null;
+    this._handlers = new Map();
+    this._messageManager = Services.cpmm;
+  }
+
+  async sendMessage(message, extensionId) {
+    const addon = await AddonManager.getAddonByID(extensionId);
+    if (!addon) {
+      throw new Error(`extension '${extensionId} does not exist`);
+    }
+    await addon.startupPromise;
+
+    const { torSendExtensionMessage } = ExtensionParent;
+    return torSendExtensionMessage(extensionId, message);
+  }
+
+  unload() {
+    if (this._callback) {
+      this._handlers.clear();
+      this._messageManager.removeMessageListener(
+        "MessageChannel:Response",
+        this._callback
+      );
+      this._callback = null;
+    }
+  }
+
+  _onMessage({ data }) {
+    const channelId = data.messageName;
+    if (this._handlers.has(channelId)) {
+      const { resolve, reject } = this._handlers.get(channelId);
+      this._handlers.delete(channelId);
+      if (data.error) {
+        reject(new Error(data.error.message));
+      } else {
+        resolve(data.value);
+      }
+    }
+  }
+
+  _init() {
+    if (this._callback === null) {
+      this._callback = this._onMessage.bind(this);
+      this._messageManager.addMessageListener(
+        "MessageChannel:Response",
+        this._callback
+      );
+    }
+  }
+}
diff --git a/browser/components/onionservices/HttpsEverywhereControl.jsm b/browser/components/onionservices/HttpsEverywhereControl.jsm
new file mode 100644
index 000000000000..60c3b5fca282
--- /dev/null
+++ b/browser/components/onionservices/HttpsEverywhereControl.jsm
@@ -0,0 +1,119 @@
+// Copyright (c) 2020, The Tor Project, Inc.
+
+"use strict";
+
+const EXPORTED_SYMBOLS = ["HttpsEverywhereControl"];
+
+const { ExtensionMessaging } = ChromeUtils.import(
+  "resource:///modules/ExtensionMessaging.jsm"
+);
+const { setTimeout } = ChromeUtils.import("resource://gre/modules/Timer.jsm");
+
+const EXTENSION_ID = "https-everywhere-eff(a)eff.org";
+const SECUREDROP_TOR_ONION_CHANNEL = {
+  name: "SecureDropTorOnion",
+  jwk: {
+    kty: "RSA",
+    e: "AQAB",
+    n:
+      "p10BbUVc5Xj2S_-MH3bACNBaISo_r9e3PVPyTTjsGsdg2qSXvqUO42fBtpFAy0zUzIGS83v4JjiRdvKJaZTIvbC8AcpymzdsTqujMm8RPTSy3hO_8mXzGa4DEsIB1uNLnUWRBKXvSGCmT9kFyxhTpkYqokNBzafVihTU34tN2Md1xFHnmZGqfYtPtbJLWAa5Z1M11EyR4lIyUxIiPTV9t1XstDbWr3iS83REJrGEFmjG1-BAgx8_lDUTa41799N2yYEhgZud7bL0M3ei8s5OERjiion5uANkUV3-s2QqUZjiVA-XR_HizXjciaUWNd683KqekpNOZ_0STh_UGwpcwU-KwG07QyiCrLrRpz8S_vH8CqGrrcWY3GSzYe9dp34jJdO65oA-G8tK6fMXtvTCFDZI6oNNaXJH71F5J0YbqO2ZqwKYc2WSi0gKVl2wd9roOVjaBmkJqvocntYuNM7t38fDEWHn5KUkmrTbiG68Cy56tDUfpKl3D9Uj4LaMvxJ1tKGvzQ4k_60odT7gIxu6DqYjXUHZpwPsSGBq3njaD7boe4CUXF2K7ViOc87BsKxRNCzDD8OklRjjXzOTOBH3PqFJ93CJ-4ECE5t9STU20aZ8E-2zKB8vjKyCySE4-kcIvBBsnkwVaJTPy9Ft1qYybo-soXEWVEZATANNWklBt8k",
+  },
+  update_path_prefix: "https://securedrop.org/https-everywhere/",
+  scope:
+    "^https?:\\/\\/[a-z0-9-]+(?:\\.[a-z0-9-]+)*\\.securedrop\\.tor\\.onion\\/",
+  replaces_default_rulesets: false,
+};
+
+class HttpsEverywhereControl {
+  constructor() {
+    this._extensionMessaging = null;
+  }
+
+  async _sendMessage(type, object) {
+    return this._extensionMessaging.sendMessage(
+      {
+        type,
+        object,
+      },
+      EXTENSION_ID
+    );
+  }
+
+  static async wait(seconds = 1) {
+    return new Promise(resolve => setTimeout(resolve, seconds * 1000));
+  }
+
+  /**
+   * Installs the .tor.onion update channel in https-everywhere
+   */
+  async installTorOnionUpdateChannel(retries = 5) {
+    this._init();
+
+    // TODO: https-everywhere store is initialized asynchronously, so sending a message
+    // immediately results in a `store.get is undefined` error.
+    // For now, let's wait a bit and retry a few times if there is an error, but perhaps
+    // we could suggest https-everywhere to send a message when that happens and listen
+    // for that here.
+    await HttpsEverywhereControl.wait();
+
+    try {
+      // TODO: we may want a way to "lock" this update channel, so that it cannot be modified
+      // by the user via UI, but I think this is not possible at the time of writing via
+      // the existing messages in https-everywhere.
+      await this._sendMessage(
+        "create_update_channel",
+        SECUREDROP_TOR_ONION_CHANNEL.name
+      );
+    } catch (e) {
+      if (retries <= 0) {
+        throw new Error("Could not install SecureDropTorOnion update channel");
+      }
+      await this.installTorOnionUpdateChannel(retries - 1);
+      return;
+    }
+
+    await this._sendMessage(
+      "update_update_channel",
+      SECUREDROP_TOR_ONION_CHANNEL
+    );
+  }
+
+  /**
+   * Returns the .tor.onion rulesets available in https-everywhere
+   */
+  async getTorOnionRules() {
+    return this._sendMessage("get_simple_rules_ending_with", ".tor.onion");
+  }
+
+  /**
+   * Returns the timestamp of the last .tor.onion update channel update.
+   */
+  async getRulesetTimestamp() {
+    const rulesets = await this._sendMessage("get_ruleset_timestamps");
+    const securedrop =
+      rulesets &&
+      rulesets.find(([{ name }]) => name === SECUREDROP_TOR_ONION_CHANNEL.name);
+    if (securedrop) {
+      const [
+        updateChannel, // This has the same structure as SECUREDROP_TOR_ONION_CHANNEL
+        lastUpdatedTimestamp, // An integer, 0 if the update channel was never updated
+      ] = securedrop;
+      void updateChannel; // Ignore eslint unused warning for ruleset
+      return lastUpdatedTimestamp;
+    }
+    return null;
+  }
+
+  unload() {
+    if (this._extensionMessaging) {
+      this._extensionMessaging.unload();
+      this._extensionMessaging = null;
+    }
+  }
+
+  _init() {
+    if (!this._extensionMessaging) {
+      this._extensionMessaging = new ExtensionMessaging();
+    }
+  }
+}
diff --git a/browser/components/onionservices/OnionAliasStore.jsm b/browser/components/onionservices/OnionAliasStore.jsm
new file mode 100644
index 000000000000..66cf569227bf
--- /dev/null
+++ b/browser/components/onionservices/OnionAliasStore.jsm
@@ -0,0 +1,201 @@
+// Copyright (c) 2020, The Tor Project, Inc.
+
+"use strict";
+
+const EXPORTED_SYMBOLS = ["OnionAliasStore"];
+
+const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
+const { XPCOMUtils } = ChromeUtils.import(
+  "resource://gre/modules/XPCOMUtils.jsm"
+);
+const { setTimeout, clearTimeout } = ChromeUtils.import(
+  "resource://gre/modules/Timer.jsm"
+);
+const { HttpsEverywhereControl } = ChromeUtils.import(
+  "resource:///modules/HttpsEverywhereControl.jsm"
+);
+
+// Logger adapted from CustomizableUI.jsm
+const kPrefOnionAliasDebug = "browser.onionalias.debug";
+XPCOMUtils.defineLazyPreferenceGetter(
+  this,
+  "gDebuggingEnabled",
+  kPrefOnionAliasDebug,
+  false,
+  (pref, oldVal, newVal) => {
+    if (typeof log != "undefined") {
+      log.maxLogLevel = newVal ? "all" : "log";
+    }
+  }
+);
+XPCOMUtils.defineLazyGetter(this, "log", () => {
+  let scope = {};
+  ChromeUtils.import("resource://gre/modules/Console.jsm", scope);
+  let consoleOptions = {
+    maxLogLevel: gDebuggingEnabled ? "all" : "log",
+    prefix: "OnionAlias",
+  };
+  return new scope.ConsoleAPI(consoleOptions);
+});
+
+function observe(topic, callback) {
+  let observer = {
+    observe(aSubject, aTopic, aData) {
+      if (topic === aTopic) {
+        callback(aSubject, aData);
+      }
+    },
+  };
+  Services.obs.addObserver(observer, topic);
+  return () => Services.obs.removeObserver(observer, topic);
+}
+
+class _OnionAliasStore {
+  static get RULESET_CHECK_INTERVAL() {
+    return 1000 * 60; // 1 minute
+  }
+
+  static get RULESET_CHECK_INTERVAL_FAST() {
+    return 1000 * 5; // 5 seconds
+  }
+
+  constructor() {
+    this._onionMap = new Map();
+    this._rulesetTimeout = null;
+    this._removeObserver = () => {};
+    this._canLoadRules = false;
+    this._rulesetTimestamp = null;
+    this._updateChannelInstalled = false;
+  }
+
+  async _periodicRulesetCheck() {
+    // TODO: it would probably be preferable to listen to some message broadcasted by
+    // the https-everywhere extension when some update channel is updated, instead of
+    // polling every N seconds.
+    log.debug("Checking for new rules");
+    const ts = await this.httpsEverywhereControl.getRulesetTimestamp();
+    log.debug(
+      `Found ruleset timestamp ${ts}, current is ${this._rulesetTimestamp}`
+    );
+    if (ts !== this._rulesetTimestamp) {
+      this._rulesetTimestamp = ts;
+      log.debug("New rules found, updating");
+      // We clear the mappings even if we cannot load the rules from https-everywhere,
+      // since we cannot be sure if the stored mappings are correct anymore.
+      this._clear();
+      if (this._canLoadRules) {
+        await this._loadRules();
+      }
+    }
+    // If the timestamp is 0, that means the update channel was not yet updated, so
+    // we schedule a check soon.
+    this._rulesetTimeout = setTimeout(
+      () => this._periodicRulesetCheck(),
+      ts === 0
+        ? _OnionAliasStore.RULESET_CHECK_INTERVAL_FAST
+        : _OnionAliasStore.RULESET_CHECK_INTERVAL
+    );
+  }
+
+  async init() {
+    this.httpsEverywhereControl = new HttpsEverywhereControl();
+
+    // Setup .tor.onion rule loading.
+    // The http observer is a fallback, and is removed in _loadRules() as soon as we are able
+    // to load some rules from HTTPS Everywhere.
+    this._loadHttpObserver();
+    try {
+      await this.httpsEverywhereControl.installTorOnionUpdateChannel();
+      this._updateChannelInstalled = true;
+      await this.httpsEverywhereControl.getTorOnionRules();
+      this._canLoadRules = true;
+    } catch (e) {
+      // Loading rules did not work, probably because "get_simple_rules_ending_with" is not yet
+      // working in https-everywhere. Use an http observer as a fallback for learning the rules.
+      log.debug(`Could not load rules: ${e.message}`);
+    }
+
+    // Setup checker for https-everywhere ruleset updates
+    if (this._updateChannelInstalled) {
+      this._periodicRulesetCheck();
+    }
+  }
+
+  /**
+   * Loads the .tor.onion mappings from https-everywhere.
+   */
+  async _loadRules() {
+    const rules = await this.httpsEverywhereControl.getTorOnionRules();
+    // Remove http observer if we are able to load some rules directly.
+    if (rules.length) {
+      this._removeObserver();
+      this._removeObserver = () => {};
+    }
+    this._clear();
+    log.debug(`Loading ${rules.length} rules`, rules);
+    for (const rule of rules) {
+      // Here we are trusting that the securedrop ruleset follows some conventions so that we can
+      // assume there is a host mapping from `rule.host` to the hostname of the URL in `rule.to`.
+      try {
+        const url = new URL(rule.to);
+        const shortHost = rule.host;
+        const longHost = url.hostname;
+        this._addMapping(shortHost, longHost);
+      } catch (e) {
+        log.error("Could not process rule:", rule);
+      }
+    }
+  }
+
+  /**
+   * Loads a http observer to listen for local redirects for populating
+   * the .tor.onion -> .onion mappings. Should only be used if we cannot ask https-everywhere
+   * directly for the mappings.
+   */
+  _loadHttpObserver() {
+    this._removeObserver = observe("http-on-before-connect", channel => {
+      if (
+        channel.isMainDocumentChannel &&
+        channel.originalURI.host.endsWith(".tor.onion")
+      ) {
+        this._addMapping(channel.originalURI.host, channel.URI.host);
+      }
+    });
+  }
+
+  uninit() {
+    this._clear();
+    this._removeObserver();
+    this._removeObserver = () => {};
+    if (this.httpsEverywhereControl) {
+      this.httpsEverywhereControl.unload();
+      delete this.httpsEverywhereControl;
+    }
+    clearTimeout(this._rulesetTimeout);
+    this._rulesetTimeout = null;
+    this._rulesetTimestamp = null;
+  }
+
+  _clear() {
+    this._onionMap.clear();
+  }
+
+  _addMapping(shortOnionHost, longOnionHost) {
+    this._onionMap.set(longOnionHost, shortOnionHost);
+  }
+
+  getShortURI(onionURI) {
+    if (
+      (onionURI.schemeIs("http") || onionURI.schemeIs("https")) &&
+      this._onionMap.has(onionURI.host)
+    ) {
+      return onionURI
+        .mutate()
+        .setHost(this._onionMap.get(onionURI.host))
+        .finalize();
+    }
+    return null;
+  }
+}
+
+let OnionAliasStore = new _OnionAliasStore();
diff --git a/browser/components/onionservices/moz.build b/browser/components/onionservices/moz.build
index 2661ad7cb9f3..815685322024 100644
--- a/browser/components/onionservices/moz.build
+++ b/browser/components/onionservices/moz.build
@@ -1 +1,7 @@
 JAR_MANIFESTS += ["jar.mn"]
+
+EXTRA_JS_MODULES += [
+    "ExtensionMessaging.jsm",
+    "HttpsEverywhereControl.jsm",
+    "OnionAliasStore.jsm",
+]
diff --git a/browser/components/urlbar/UrlbarInput.jsm b/browser/components/urlbar/UrlbarInput.jsm
index e448f6f7ba83..827ea6f19128 100644
--- a/browser/components/urlbar/UrlbarInput.jsm
+++ b/browser/components/urlbar/UrlbarInput.jsm
@@ -330,7 +330,10 @@ class UrlbarInput {
     // bar if the user has deleted the URL and we'd just put the same URL
     // back. See bug 304198.
     if (value === null) {
-      uri = uri || this.window.gBrowser.currentURI;
+      uri =
+        uri ||
+        this.window.gBrowser.selectedBrowser.currentOnionAliasURI ||
+        this.window.gBrowser.currentURI;
       // Strip off usernames and passwords for the location bar
       try {
         uri = Services.io.createExposableURI(uri);
@@ -2100,7 +2103,13 @@ class UrlbarInput {
     }
 
     let uri;
-    if (this.getAttribute("pageproxystate") == "valid") {
+    // When we rewrite .onion to an alias, gBrowser.currentURI will be different than
+    // the URI displayed in the urlbar. We need to use the urlbar value to copy the
+    // alias instead of the actual .onion URI that is loaded.
+    if (
+      this.getAttribute("pageproxystate") == "valid" &&
+      !this.window.gBrowser.selectedBrowser.currentOnionAliasURI
+    ) {
       uri = this.window.gBrowser.currentURI;
     } else {
       // The value could be:
diff --git a/docshell/base/nsDocShell.cpp b/docshell/base/nsDocShell.cpp
index 94ceeb67f301..3f5c8eab97b3 100644
--- a/docshell/base/nsDocShell.cpp
+++ b/docshell/base/nsDocShell.cpp
@@ -5993,6 +5993,10 @@ void nsDocShell::OnRedirectStateChange(nsIChannel* aOldChannel,
     return;
   }
 
+  if (!mOnionUrlbarRewritesAllowed && IsTorOnionRedirect(oldURI, newURI)) {
+    mOnionUrlbarRewritesAllowed = true;
+  }
+
   // DocumentChannel adds redirect chain to global history in the parent
   // process. The redirect chain can't be queried from the content process, so
   // there's no need to update global history here.
@@ -9405,6 +9409,20 @@ static bool NavigationShouldTakeFocus(nsDocShell* aDocShell,
   return !Preferences::GetBool("browser.tabs.loadDivertedInBackground", false);
 }
 
+/* static */
+bool nsDocShell::IsTorOnionRedirect(nsIURI* aOldURI, nsIURI* aNewURI) {
+  nsAutoCString oldHost;
+  nsAutoCString newHost;
+  if (aOldURI && aNewURI && NS_SUCCEEDED(aOldURI->GetHost(oldHost)) &&
+      StringEndsWith(oldHost, ".tor.onion"_ns) &&
+      NS_SUCCEEDED(aNewURI->GetHost(newHost)) &&
+      StringEndsWith(newHost, ".onion"_ns) &&
+      !StringEndsWith(newHost, ".tor.onion"_ns)) {
+    return true;
+  }
+  return false;
+}
+
 nsresult nsDocShell::InternalLoad(nsDocShellLoadState* aLoadState,
                                   Maybe<uint32_t> aCacheKey) {
   MOZ_ASSERT(aLoadState, "need a load state!");
@@ -9558,6 +9576,30 @@ nsresult nsDocShell::InternalLoad(nsDocShellLoadState* aLoadState,
 
   mAllowKeywordFixup = aLoadState->HasInternalLoadFlags(
       INTERNAL_LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP);
+
+  if (mOnionUrlbarRewritesAllowed) {
+    mOnionUrlbarRewritesAllowed = false;
+    nsCOMPtr<nsIURI> referrer;
+    nsIReferrerInfo* referrerInfo = aLoadState->GetReferrerInfo();
+    if (referrerInfo) {
+      referrerInfo->GetOriginalReferrer(getter_AddRefs(referrer));
+      bool isPrivateWin = false;
+      Document* doc = GetDocument();
+      if (doc) {
+        isPrivateWin =
+            doc->NodePrincipal()->OriginAttributesRef().mPrivateBrowsingId > 0;
+        nsCOMPtr<nsIScriptSecurityManager> secMan =
+            do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID);
+        mOnionUrlbarRewritesAllowed =
+            secMan && NS_SUCCEEDED(secMan->CheckSameOriginURI(
+                          aLoadState->URI(), referrer, false, isPrivateWin));
+      }
+    }
+  }
+  mOnionUrlbarRewritesAllowed =
+      mOnionUrlbarRewritesAllowed ||
+      aLoadState->HasInternalLoadFlags(INTERNAL_LOAD_FLAGS_ALLOW_ONION_URLBAR_REWRITES);
+
   mURIResultedInDocument = false;  // reset the clock...
 
   // See if this is actually a load between two history entries for the same
@@ -11916,6 +11958,7 @@ nsresult nsDocShell::AddToSessionHistory(
                 HistoryID(), GetCreatedDynamically(), originalURI,
                 resultPrincipalURI, loadReplace, referrerInfo, srcdoc,
                 srcdocEntry, baseURI, saveLayoutState, expired, userActivation);
+  entry->SetOnionUrlbarRewritesAllowed(mOnionUrlbarRewritesAllowed);
 
   if (mBrowsingContext->IsTop() && GetSessionHistory()) {
     bool shouldPersist = ShouldAddToSessionHistory(aURI, aChannel);
@@ -13815,3 +13858,12 @@ void nsDocShell::MaybeDisconnectChildListenersOnPageHide() {
     mChannelToDisconnectOnPageHide = 0;
   }
 }
+
+NS_IMETHODIMP
+nsDocShell::GetOnionUrlbarRewritesAllowed(bool* aOnionUrlbarRewritesAllowed) {
+  NS_ENSURE_ARG(aOnionUrlbarRewritesAllowed);
+  *aOnionUrlbarRewritesAllowed =
+      StaticPrefs::browser_urlbar_onionRewrites_enabled() &&
+      mOnionUrlbarRewritesAllowed;
+  return NS_OK;
+}
diff --git a/docshell/base/nsDocShell.h b/docshell/base/nsDocShell.h
index fe61eda9267d..30f7fcfe1bbd 100644
--- a/docshell/base/nsDocShell.h
+++ b/docshell/base/nsDocShell.h
@@ -134,6 +134,9 @@ class nsDocShell final : public nsDocLoader,
 
     // Whether the load should go through LoadURIDelegate.
     INTERNAL_LOAD_FLAGS_BYPASS_LOAD_URI_DELEGATE = 0x2000,
+
+    // Whether rewriting the urlbar to a short .onion alias is allowed.
+    INTERNAL_LOAD_FLAGS_ALLOW_ONION_URLBAR_REWRITES = 0x4000,
   };
 
   // Event type dispatched by RestorePresentation
@@ -563,6 +566,8 @@ class nsDocShell final : public nsDocLoader,
 
   virtual void DestroyChildren() override;
 
+  static bool IsTorOnionRedirect(nsIURI* aOldURI, nsIURI* aNewURI);
+
   // Overridden from nsDocLoader, this provides more information than the
   // normal OnStateChange with flags STATE_REDIRECTING
   virtual void OnRedirectStateChange(nsIChannel* aOldChannel,
@@ -1254,6 +1259,7 @@ class nsDocShell final : public nsDocLoader,
   bool mCSSErrorReportingEnabled : 1;
   bool mAllowAuth : 1;
   bool mAllowKeywordFixup : 1;
+  bool mOnionUrlbarRewritesAllowed : 1;
   bool mDisableMetaRefreshWhenInactive : 1;
   bool mIsAppTab : 1;
   bool mDeviceSizeIsPageSize : 1;
diff --git a/docshell/base/nsDocShellLoadState.cpp b/docshell/base/nsDocShellLoadState.cpp
index 7122c2769119..5fb9f4aab2b5 100644
--- a/docshell/base/nsDocShellLoadState.cpp
+++ b/docshell/base/nsDocShellLoadState.cpp
@@ -847,6 +847,14 @@ void nsDocShellLoadState::CalculateLoadURIFlags() {
     mInternalLoadFlags |= nsDocShell::INTERNAL_LOAD_FLAGS_FIRST_LOAD;
   }
 
+  if (mLoadFlags & nsIWebNavigation::LOAD_FLAGS_ALLOW_ONION_URLBAR_REWRITES) {
+    mInternalLoadFlags |= nsDocShell::INTERNAL_LOAD_FLAGS_ALLOW_ONION_URLBAR_REWRITES;
+  }
+
+  if (mLoadFlags & nsIWebNavigation::LOAD_FLAGS_FIRST_LOAD) {
+    mInternalLoadFlags |= nsDocShell::INTERNAL_LOAD_FLAGS_FIRST_LOAD;
+  }
+
   if (mLoadFlags & nsIWebNavigation::LOAD_FLAGS_BYPASS_CLASSIFIER) {
     mInternalLoadFlags |= nsDocShell::INTERNAL_LOAD_FLAGS_BYPASS_CLASSIFIER;
   }
diff --git a/docshell/base/nsIDocShell.idl b/docshell/base/nsIDocShell.idl
index dcf0b8c00d70..15887de5cbda 100644
--- a/docshell/base/nsIDocShell.idl
+++ b/docshell/base/nsIDocShell.idl
@@ -864,4 +864,9 @@ interface nsIDocShell : nsIDocShellTreeItem
    * until session history state is moved into the parent process.
    */
   void persistLayoutHistoryState();
+
+  /**
+   * Whether rewriting the urlbar to a short .onion alias is allowed.
+   */
+  [infallible] readonly attribute boolean onionUrlbarRewritesAllowed;
 };
diff --git a/docshell/base/nsIWebNavigation.idl b/docshell/base/nsIWebNavigation.idl
index bec4f13d8b2b..fa00e155cba7 100644
--- a/docshell/base/nsIWebNavigation.idl
+++ b/docshell/base/nsIWebNavigation.idl
@@ -268,6 +268,11 @@ interface nsIWebNavigation : nsISupports
    */
   const unsigned long LOAD_FLAGS_USER_ACTIVATION = 0x8000000;
 
+  /**
+   * Allow rewriting the urlbar to a short .onion alias.
+   */
+  const unsigned long LOAD_FLAGS_ALLOW_ONION_URLBAR_REWRITES = 0x8000000;
+
   /**
    * Loads a given URI.  This will give priority to loading the requested URI
    * in the object implementing this interface.  If it can't be loaded here
diff --git a/docshell/shistory/SessionHistoryEntry.cpp b/docshell/shistory/SessionHistoryEntry.cpp
index 61ec28bbb9be..9890c99b22dc 100644
--- a/docshell/shistory/SessionHistoryEntry.cpp
+++ b/docshell/shistory/SessionHistoryEntry.cpp
@@ -926,6 +926,20 @@ SessionHistoryEntry::SetPersist(bool aPersist) {
   return NS_OK;
 }
 
+NS_IMETHODIMP
+SessionHistoryEntry::GetOnionUrlbarRewritesAllowed(
+    bool* aOnionUrlbarRewritesAllowed) {
+  *aOnionUrlbarRewritesAllowed = mInfo->mOnionUrlbarRewritesAllowed;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+SessionHistoryEntry::SetOnionUrlbarRewritesAllowed(
+    bool aOnionUrlbarRewritesAllowed) {
+  mInfo->mOnionUrlbarRewritesAllowed = aOnionUrlbarRewritesAllowed;
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 SessionHistoryEntry::GetScrollPosition(int32_t* aX, int32_t* aY) {
   *aX = mInfo->mScrollPositionX;
diff --git a/docshell/shistory/SessionHistoryEntry.h b/docshell/shistory/SessionHistoryEntry.h
index e74311578368..aa4c86f2a368 100644
--- a/docshell/shistory/SessionHistoryEntry.h
+++ b/docshell/shistory/SessionHistoryEntry.h
@@ -170,6 +170,7 @@ class SessionHistoryInfo {
   bool mPersist = true;
   bool mHasUserInteraction = false;
   bool mHasUserActivation = false;
+  bool mOnionUrlbarRewritesAllowed = false;
 
   union SharedState {
     SharedState();
diff --git a/docshell/shistory/nsISHEntry.idl b/docshell/shistory/nsISHEntry.idl
index 73ac40551d4e..622402456d07 100644
--- a/docshell/shistory/nsISHEntry.idl
+++ b/docshell/shistory/nsISHEntry.idl
@@ -260,6 +260,11 @@ interface nsISHEntry : nsISupports
      */
     [infallible] attribute boolean persist;
 
+    /**
+     * Whether rewriting the urlbar to a short .onion alias is allowed.
+     */
+    [infallible] attribute boolean onionUrlbarRewritesAllowed;
+
     /**
      * Set/Get the visual viewport scroll position if session history is
      * changed through anchor navigation or pushState.
diff --git a/docshell/shistory/nsSHEntry.cpp b/docshell/shistory/nsSHEntry.cpp
index 1e4000eacd2b..41ea6086df8b 100644
--- a/docshell/shistory/nsSHEntry.cpp
+++ b/docshell/shistory/nsSHEntry.cpp
@@ -44,7 +44,8 @@ nsSHEntry::nsSHEntry()
       mLoadedInThisProcess(false),
       mPersist(true),
       mHasUserInteraction(false),
-      mHasUserActivation(false) {}
+      mHasUserActivation(false),
+      mOnionUrlbarRewritesAllowed(false) {}
 
 nsSHEntry::nsSHEntry(const nsSHEntry& aOther)
     : mShared(aOther.mShared),
@@ -72,7 +73,8 @@ nsSHEntry::nsSHEntry(const nsSHEntry& aOther)
       mLoadedInThisProcess(aOther.mLoadedInThisProcess),
       mPersist(aOther.mPersist),
       mHasUserInteraction(false),
-      mHasUserActivation(aOther.mHasUserActivation) {}
+      mHasUserActivation(aOther.mHasUserActivation),
+      mOnionUrlbarRewritesAllowed(aOther.mOnionUrlbarRewritesAllowed) {}
 
 nsSHEntry::~nsSHEntry() {
   // Null out the mParent pointers on all our kids.
@@ -880,6 +882,18 @@ nsSHEntry::SetPersist(bool aPersist) {
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsSHEntry::GetOnionUrlbarRewritesAllowed(bool* aOnionUrlbarRewritesAllowed) {
+  *aOnionUrlbarRewritesAllowed = mOnionUrlbarRewritesAllowed;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSHEntry::SetOnionUrlbarRewritesAllowed(bool aOnionUrlbarRewritesAllowed) {
+  mOnionUrlbarRewritesAllowed = aOnionUrlbarRewritesAllowed;
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 nsSHEntry::CreateLoadInfo(nsDocShellLoadState** aLoadState) {
   nsCOMPtr<nsIURI> uri = GetURI();
@@ -929,6 +943,10 @@ nsSHEntry::CreateLoadInfo(nsDocShellLoadState** aLoadState) {
   } else {
     srcdoc = VoidString();
   }
+  if (GetOnionUrlbarRewritesAllowed()) {
+    flags |= nsDocShell::InternalLoad::
+        INTERNAL_LOAD_FLAGS_ALLOW_ONION_URLBAR_REWRITES;
+  }
   loadState->SetSrcdocData(srcdoc);
   loadState->SetBaseURI(baseURI);
   loadState->SetInternalLoadFlags(flags);
diff --git a/docshell/shistory/nsSHEntry.h b/docshell/shistory/nsSHEntry.h
index 326b0092cf94..76be0ac65050 100644
--- a/docshell/shistory/nsSHEntry.h
+++ b/docshell/shistory/nsSHEntry.h
@@ -66,6 +66,7 @@ class nsSHEntry : public nsISHEntry {
   bool mPersist;
   bool mHasUserInteraction;
   bool mHasUserActivation;
+  bool mOnionUrlbarRewritesAllowed;
 };
 
 #endif /* nsSHEntry_h */
diff --git a/dom/interfaces/base/nsIBrowser.idl b/dom/interfaces/base/nsIBrowser.idl
index 1a05957dba83..1c42486da87c 100644
--- a/dom/interfaces/base/nsIBrowser.idl
+++ b/dom/interfaces/base/nsIBrowser.idl
@@ -130,7 +130,8 @@ interface nsIBrowser : nsISupports
                                in boolean aIsSynthetic,
                                in boolean aHasRequestContextID,
                                in uint64_t aRequestContextID,
-                               in AString aContentType);
+                               in AString aContentType,
+                               in boolean aOnionUrlbarRewritesAllowed);
 
   /**
    * Determine what process switching behavior this browser element should have.
diff --git a/dom/ipc/BrowserChild.cpp b/dom/ipc/BrowserChild.cpp
index ce5e1ff14890..0830c22d0b5c 100644
--- a/dom/ipc/BrowserChild.cpp
+++ b/dom/ipc/BrowserChild.cpp
@@ -3621,6 +3621,8 @@ NS_IMETHODIMP BrowserChild::OnLocationChange(nsIWebProgress* aWebProgress,
         docShell->GetMayEnableCharacterEncodingMenu();
     locationChangeData->charsetAutodetected() =
         docShell->GetCharsetAutodetected();
+    locationChangeData->onionUrlbarRewritesAllowed() =
+        docShell->GetOnionUrlbarRewritesAllowed();
 
     locationChangeData->contentPrincipal() = document->NodePrincipal();
     locationChangeData->contentPartitionedPrincipal() =
diff --git a/dom/ipc/BrowserParent.cpp b/dom/ipc/BrowserParent.cpp
index 240b386f6dde..fd14908abc85 100644
--- a/dom/ipc/BrowserParent.cpp
+++ b/dom/ipc/BrowserParent.cpp
@@ -2794,7 +2794,8 @@ mozilla::ipc::IPCResult BrowserParent::RecvOnLocationChange(
           aLocationChangeData->isSyntheticDocument(),
           aLocationChangeData->requestContextID().isSome(),
           aLocationChangeData->requestContextID().valueOr(0),
-          aLocationChangeData->contentType());
+          aLocationChangeData->contentType(),
+          aLocationChangeData->onionUrlbarRewritesAllowed());
     }
   }
 
diff --git a/dom/ipc/PBrowser.ipdl b/dom/ipc/PBrowser.ipdl
index 29433edcde78..4a0086a98c50 100644
--- a/dom/ipc/PBrowser.ipdl
+++ b/dom/ipc/PBrowser.ipdl
@@ -145,6 +145,7 @@ struct WebProgressLocationChangeData
   bool isSyntheticDocument;
   bool mayEnableCharacterEncodingMenu;
   bool charsetAutodetected;
+  bool onionUrlbarRewritesAllowed;
   nsString contentType;
   nsString title;
   nsString charset;
diff --git a/modules/libpref/init/StaticPrefList.yaml b/modules/libpref/init/StaticPrefList.yaml
index cc155b47b645..238177c47894 100644
--- a/modules/libpref/init/StaticPrefList.yaml
+++ b/modules/libpref/init/StaticPrefList.yaml
@@ -1329,6 +1329,12 @@
   value: true
   mirror: always
 
+  # Whether rewriting the urlbar to a short .onion alias is allowed.
+- name: browser.urlbar.onionRewrites.enabled
+  type: RelaxedAtomicBool
+  value: true
+  mirror: always
+
 - name: browser.viewport.desktopWidth
   type: RelaxedAtomicInt32
   value: 980
diff --git a/netwerk/dns/effective_tld_names.dat b/netwerk/dns/effective_tld_names.dat
index 9502869c2443..100cb4817dfe 100644
--- a/netwerk/dns/effective_tld_names.dat
+++ b/netwerk/dns/effective_tld_names.dat
@@ -5518,6 +5518,8 @@ pro.om
 
 // onion : https://tools.ietf.org/html/rfc7686
 onion
+tor.onion
+securedrop.tor.onion
 
 // org : https://en.wikipedia.org/wiki/.org
 org
diff --git a/netwerk/ipc/DocumentLoadListener.cpp b/netwerk/ipc/DocumentLoadListener.cpp
index 27cc9939dc5f..7a6fddedd411 100644
--- a/netwerk/ipc/DocumentLoadListener.cpp
+++ b/netwerk/ipc/DocumentLoadListener.cpp
@@ -2522,6 +2522,16 @@ DocumentLoadListener::AsyncOnChannelRedirect(
        "mHaveVisibleRedirect=%c",
        this, mHaveVisibleRedirect ? 'T' : 'F'));
 
+  // Like the code above for allowing mixed content, we need to check this here
+  // in case the redirect is not handled in the docshell.
+  nsCOMPtr<nsIURI> oldURI, newURI;
+  aOldChannel->GetURI(getter_AddRefs(oldURI));
+  aNewChannel->GetURI(getter_AddRefs(newURI));
+  if (nsDocShell::IsTorOnionRedirect(oldURI, newURI)) {
+    mLoadStateInternalLoadFlags |=
+        nsDocShell::INTERNAL_LOAD_FLAGS_ALLOW_ONION_URLBAR_REWRITES;
+  }
+
   // We need the original URI of the current channel to use to open the real
   // channel in the content process. Unfortunately we overwrite the original
   // uri of the new channel with the original pre-redirect URI, so grab
diff --git a/toolkit/content/widgets/browser-custom-element.js b/toolkit/content/widgets/browser-custom-element.js
index 778cadd6b810..bcf622e70c65 100644
--- a/toolkit/content/widgets/browser-custom-element.js
+++ b/toolkit/content/widgets/browser-custom-element.js
@@ -255,6 +255,8 @@
 
       this._mayEnableCharacterEncodingMenu = null;
 
+      this._onionUrlbarRewritesAllowed = false;
+
       this._charsetAutodetected = false;
 
       this._contentPrincipal = null;
@@ -615,6 +617,12 @@
       }
     }
 
+    get onionUrlbarRewritesAllowed() {
+      return this.isRemoteBrowser
+        ? this._onionUrlbarRewritesAllowed
+        : this.docShell.onionUrlbarRewritesAllowed;
+    }
+
     get charsetAutodetected() {
       return this.isRemoteBrowser
         ? this._charsetAutodetected
@@ -1157,7 +1165,8 @@
       aIsSynthetic,
       aHaveRequestContextID,
       aRequestContextID,
-      aContentType
+      aContentType,
+      aOnionUrlbarRewritesAllowed
     ) {
       if (this.isRemoteBrowser && this.messageManager) {
         if (aCharset != null) {
@@ -1180,6 +1189,7 @@
         this._contentRequestContextID = aHaveRequestContextID
           ? aRequestContextID
           : null;
+        this._onionUrlbarRewritesAllowed = aOnionUrlbarRewritesAllowed;
       }
     }
 
@@ -1582,6 +1592,7 @@
             "_contentPrincipal",
             "_contentPartitionedPrincipal",
             "_isSyntheticDocument",
+            "_onionUrlbarRewritesAllowed",
           ]
         );
       }
diff --git a/toolkit/modules/sessionstore/SessionHistory.jsm b/toolkit/modules/sessionstore/SessionHistory.jsm
index 87af372acb79..a03eb85b938b 100644
--- a/toolkit/modules/sessionstore/SessionHistory.jsm
+++ b/toolkit/modules/sessionstore/SessionHistory.jsm
@@ -313,6 +313,7 @@ var SessionHistoryInternal = {
     }
 
     entry.persist = shEntry.persist;
+    entry.onionUrlbarRewritesAllowed = shEntry.onionUrlbarRewritesAllowed;
 
     return entry;
   },
@@ -607,6 +608,10 @@ var SessionHistoryInternal = {
       }
     }
 
+    if (entry.onionUrlbarRewritesAllowed) {
+      shEntry.onionUrlbarRewritesAllowed = entry.onionUrlbarRewritesAllowed;
+    }
+
     return shEntry;
   },
 
diff --git a/xpcom/reflect/xptinfo/xptinfo.h b/xpcom/reflect/xptinfo/xptinfo.h
index efee881c1421..4295efb39f1f 100644
--- a/xpcom/reflect/xptinfo/xptinfo.h
+++ b/xpcom/reflect/xptinfo/xptinfo.h
@@ -514,7 +514,8 @@ static_assert(sizeof(nsXPTMethodInfo) == 8, "wrong size");
 #if defined(MOZ_THUNDERBIRD) || defined(MOZ_SUITE)
 #  define PARAM_BUFFER_COUNT 18
 #else
-#  define PARAM_BUFFER_COUNT 14
+// The max is currently updateForLocationChange in nsIBrowser.idl
+#  define PARAM_BUFFER_COUNT 15
 #endif
 
 /**
                    
                  
                  
                          
                            
                            1
                            
                          
                          
                            
                            0
                            
                          
                          
                            
    
                          
                        
                     
                        
                    
                        
                            
                                
                            
                            [tor-browser/tor-browser-90.0b12-10.5-1] Bug 21952: Implement Onion-Location
                        
                        
by sysrqb@torproject.org 02 Jul '21
                    by sysrqb@torproject.org 02 Jul '21
02 Jul '21
                    
                        commit b89a990a1a84d51f62e7bb72598608b88f458de8
Author: Alex Catarineu <acat(a)torproject.org>
Date:   Thu Mar 5 22:16:39 2020 +0100
    Bug 21952: Implement Onion-Location
    
    Whenever a valid Onion-Location HTTP header (or corresponding HTML
    <meta> http-equiv attribute) is found in a document load, we either
    redirect to it (if the user opted-in via preference) or notify the
    presence of an onionsite alternative with a badge in the urlbar.
---
 browser/base/content/browser.js                    |  12 ++
 browser/base/content/browser.xhtml                 |   3 +
 browser/components/BrowserGlue.jsm                 |  13 ++
 .../onionservices/OnionLocationChild.jsm           |  39 +++++
 .../onionservices/OnionLocationParent.jsm          | 168 +++++++++++++++++++++
 .../content/onionlocation-notification-icons.css   |   5 +
 .../onionservices/content/onionlocation-urlbar.css |  27 ++++
 .../content/onionlocation-urlbar.inc.xhtml         |  10 ++
 .../onionservices/content/onionlocation.svg        |   3 +
 .../content/onionlocationPreferences.inc.xhtml     |  11 ++
 .../content/onionlocationPreferences.js            |  31 ++++
 browser/components/onionservices/jar.mn            |   2 +
 browser/components/onionservices/moz.build         |   2 +
 browser/components/preferences/privacy.inc.xhtml   |   2 +
 browser/components/preferences/privacy.js          |  17 +++
 browser/themes/shared/notification-icons.inc.css   |   2 +
 browser/themes/shared/urlbar-searchbar.inc.css     |   2 +
 dom/base/Document.cpp                              |  34 ++++-
 dom/base/Document.h                                |   2 +
 dom/webidl/Document.webidl                         |   8 +
 modules/libpref/init/StaticPrefList.yaml           |   5 +
 xpcom/ds/StaticAtoms.py                            |   1 +
 22 files changed, 398 insertions(+), 1 deletion(-)
diff --git a/browser/base/content/browser.js b/browser/base/content/browser.js
index 7103cd2c374b..a443220ba6e8 100644
--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -50,6 +50,7 @@ XPCOMUtils.defineLazyModuleGetters(this, {
   NetUtil: "resource://gre/modules/NetUtil.jsm",
   NewTabUtils: "resource://gre/modules/NewTabUtils.jsm",
   OpenInTabsUtils: "resource:///modules/OpenInTabsUtils.jsm",
+  OnionLocationParent: "resource:///modules/OnionLocationParent.jsm",
   PageActions: "resource:///modules/PageActions.jsm",
   PageThumbs: "resource://gre/modules/PageThumbs.jsm",
   PanelMultiView: "resource:///modules/PanelMultiView.jsm",
@@ -5310,6 +5311,7 @@ var XULBrowserWindow = {
     CFRPageActions.updatePageActions(gBrowser.selectedBrowser);
 
     AboutReaderParent.updateReaderButton(gBrowser.selectedBrowser);
+    OnionLocationParent.updateOnionLocationBadge(gBrowser.selectedBrowser);
 
     if (!gMultiProcessBrowser) {
       // Bug 1108553 - Cannot rotate images with e10s
@@ -5800,6 +5802,16 @@ var CombinedStopReload = {
 
 var TabsProgressListener = {
   onStateChange(aBrowser, aWebProgress, aRequest, aStateFlags, aStatus) {
+    // Clear OnionLocation UI
+    if (
+      aStateFlags & Ci.nsIWebProgressListener.STATE_START &&
+      aStateFlags & Ci.nsIWebProgressListener.STATE_IS_NETWORK &&
+      aRequest &&
+      aWebProgress.isTopLevel
+    ) {
+      OnionLocationParent.onStateChange(aBrowser);
+    }
+
     // Collect telemetry data about tab load times.
     if (
       aWebProgress.isTopLevel &&
diff --git a/browser/base/content/browser.xhtml b/browser/base/content/browser.xhtml
index e4f3363e2180..5b64d914d414 100644
--- a/browser/base/content/browser.xhtml
+++ b/browser/base/content/browser.xhtml
@@ -2039,6 +2039,9 @@
                        onclick="FullZoom.reset(); FullZoom.resetScalingZoom();"
                        tooltip="dynamic-shortcut-tooltip"
                        hidden="true"/>
+
+#include ../../components/onionservices/content/onionlocation-urlbar.inc.xhtml
+
                 <hbox id="pageActionButton"
                       class="urlbar-page-action urlbar-icon-wrapper"
                       role="button"
diff --git a/browser/components/BrowserGlue.jsm b/browser/components/BrowserGlue.jsm
index 5b320bd989f0..c23f926a2de2 100644
--- a/browser/components/BrowserGlue.jsm
+++ b/browser/components/BrowserGlue.jsm
@@ -546,6 +546,19 @@ let JSWINDOWACTORS = {
     allFrames: true,
   },
 
+  OnionLocation: {
+    parent: {
+      moduleURI: "resource:///modules/OnionLocationParent.jsm",
+    },
+    child: {
+      moduleURI: "resource:///modules/OnionLocationChild.jsm",
+      events: {
+        pageshow: { mozSystemGroup: true },
+      },
+    },
+    messageManagerGroups: ["browsers"],
+  },
+
   PageInfo: {
     child: {
       moduleURI: "resource:///actors/PageInfoChild.jsm",
diff --git a/browser/components/onionservices/OnionLocationChild.jsm b/browser/components/onionservices/OnionLocationChild.jsm
new file mode 100644
index 000000000000..9e00054ac56c
--- /dev/null
+++ b/browser/components/onionservices/OnionLocationChild.jsm
@@ -0,0 +1,39 @@
+// Copyright (c) 2020, The Tor Project, Inc.
+
+"use strict";
+
+var EXPORTED_SYMBOLS = ["OnionLocationChild"];
+
+class OnionLocationChild extends JSWindowActorChild {
+  handleEvent(event) {
+    this.onPageShow(event);
+  }
+
+  onPageShow(event) {
+    if (event.target != this.document) {
+      return;
+    }
+    const onionLocationURI = this.document.onionLocationURI;
+    if (onionLocationURI) {
+      this.sendAsyncMessage("OnionLocation:Set");
+    }
+  }
+
+  receiveMessage(aMessage) {
+    if (aMessage.name == "OnionLocation:Refresh") {
+      const doc = this.document;
+      const docShell = this.docShell;
+      const onionLocationURI = doc.onionLocationURI;
+      const refreshURI = docShell.QueryInterface(Ci.nsIRefreshURI);
+      if (onionLocationURI && refreshURI) {
+        refreshURI.refreshURI(
+          onionLocationURI,
+          doc.nodePrincipal,
+          0,
+          false,
+          true
+        );
+      }
+    }
+  }
+}
diff --git a/browser/components/onionservices/OnionLocationParent.jsm b/browser/components/onionservices/OnionLocationParent.jsm
new file mode 100644
index 000000000000..f6250e554862
--- /dev/null
+++ b/browser/components/onionservices/OnionLocationParent.jsm
@@ -0,0 +1,168 @@
+// Copyright (c) 2020, The Tor Project, Inc.
+
+"use strict";
+
+var EXPORTED_SYMBOLS = ["OnionLocationParent"];
+
+const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
+const { TorStrings } = ChromeUtils.import("resource:///modules/TorStrings.jsm");
+
+// Prefs
+const NOTIFICATION_PREF = "privacy.prioritizeonions.showNotification";
+const PRIORITIZE_ONIONS_PREF = "privacy.prioritizeonions.enabled";
+
+// Element IDs
+const ONIONLOCATION_BOX_ID = "onion-location-box";
+const ONIONLOCATION_BUTTON_ID = "onion-location-button";
+const ONIONLOCATION_LABEL_ID = "onion-label";
+
+// Notification IDs
+const NOTIFICATION_ID = "onion-location";
+const NOTIFICATION_ANCHOR_ID = "onionlocation";
+
+// Strings
+const STRING_ONION_AVAILABLE = TorStrings.onionLocation.onionAvailable;
+const NOTIFICATION_CANCEL_LABEL = TorStrings.onionLocation.notNow;
+const NOTIFICATION_CANCEL_ACCESSKEY = TorStrings.onionLocation.notNowAccessKey;
+const NOTIFICATION_OK_LABEL = TorStrings.onionLocation.alwaysPrioritize;
+const NOTIFICATION_OK_ACCESSKEY =
+  TorStrings.onionLocation.alwaysPrioritizeAccessKey;
+const NOTIFICATION_TITLE = TorStrings.onionLocation.tryThis;
+const NOTIFICATION_DESCRIPTION = TorStrings.onionLocation.description;
+const NOTIFICATION_LEARN_MORE_URL = TorStrings.onionLocation.learnMoreURL;
+
+class OnionLocationParent extends JSWindowActorParent {
+  // Listeners are added in BrowserGlue.jsm
+  receiveMessage(aMsg) {
+    switch (aMsg.name) {
+      case "OnionLocation:Set":
+        let browser = this.browsingContext.embedderElement;
+        OnionLocationParent.setOnionLocation(browser);
+        break;
+    }
+  }
+
+  static buttonClick(event) {
+    if (event.button !== 0) {
+      return;
+    }
+    const win = event.target.ownerGlobal;
+    if (win.gBrowser) {
+      const browser = win.gBrowser.selectedBrowser;
+      OnionLocationParent.redirect(browser);
+    }
+  }
+
+  static redirect(browser) {
+    let windowGlobal = browser.browsingContext.currentWindowGlobal;
+    let actor = windowGlobal.getActor("OnionLocation");
+    if (actor) {
+      actor.sendAsyncMessage("OnionLocation:Refresh", {});
+      OnionLocationParent.setDisabled(browser);
+    }
+  }
+
+  static onStateChange(browser) {
+    delete browser._onionLocation;
+    OnionLocationParent.hideNotification(browser);
+  }
+
+  static setOnionLocation(browser) {
+    browser._onionLocation = true;
+    let tabBrowser = browser.getTabBrowser();
+    if (tabBrowser && browser === tabBrowser.selectedBrowser) {
+      OnionLocationParent.updateOnionLocationBadge(browser);
+    }
+  }
+
+  static hideNotification(browser) {
+    const win = browser.ownerGlobal;
+    if (browser._onionLocationPrompt) {
+      win.PopupNotifications.remove(browser._onionLocationPrompt);
+    }
+  }
+
+  static showNotification(browser) {
+    const mustShow = Services.prefs.getBoolPref(NOTIFICATION_PREF, true);
+    if (!mustShow) {
+      return;
+    }
+
+    const win = browser.ownerGlobal;
+    Services.prefs.setBoolPref(NOTIFICATION_PREF, false);
+
+    const mainAction = {
+      label: NOTIFICATION_OK_LABEL,
+      accessKey: NOTIFICATION_OK_ACCESSKEY,
+      callback() {
+        Services.prefs.setBoolPref(PRIORITIZE_ONIONS_PREF, true);
+        OnionLocationParent.redirect(browser);
+        win.openPreferences("privacy-onionservices");
+      },
+    };
+
+    const cancelAction = {
+      label: NOTIFICATION_CANCEL_LABEL,
+      accessKey: NOTIFICATION_CANCEL_ACCESSKEY,
+      callback: () => {},
+    };
+
+    const options = {
+      autofocus: true,
+      persistent: true,
+      removeOnDismissal: false,
+      eventCallback(aTopic) {
+        if (aTopic === "removed") {
+          delete browser._onionLocationPrompt;
+          delete browser.onionpopupnotificationanchor;
+        }
+      },
+      learnMoreURL: NOTIFICATION_LEARN_MORE_URL,
+      displayURI: {
+        hostPort: NOTIFICATION_TITLE, // This is hacky, but allows us to have a title without extra markup/css.
+      },
+      hideClose: true,
+      popupIconClass: "onionlocation-notification-icon",
+    };
+
+    // A hacky way of setting the popup anchor outside the usual url bar icon box
+    // onionlocationpopupnotificationanchor comes from `${ANCHOR_ID}popupnotificationanchor`
+    // From https://searchfox.org/mozilla-esr68/rev/080f9ed47742644d2ff84f7aa0b10aea5c4…
+    browser.onionlocationpopupnotificationanchor = win.document.getElementById(
+      ONIONLOCATION_BUTTON_ID
+    );
+
+    browser._onionLocationPrompt = win.PopupNotifications.show(
+      browser,
+      NOTIFICATION_ID,
+      NOTIFICATION_DESCRIPTION,
+      NOTIFICATION_ANCHOR_ID,
+      mainAction,
+      [cancelAction],
+      options
+    );
+  }
+
+  static setEnabled(browser) {
+    const win = browser.ownerGlobal;
+    const label = win.document.getElementById(ONIONLOCATION_LABEL_ID);
+    label.textContent = STRING_ONION_AVAILABLE;
+    const elem = win.document.getElementById(ONIONLOCATION_BOX_ID);
+    elem.removeAttribute("hidden");
+  }
+
+  static setDisabled(browser) {
+    const win = browser.ownerGlobal;
+    const elem = win.document.getElementById(ONIONLOCATION_BOX_ID);
+    elem.setAttribute("hidden", true);
+  }
+
+  static updateOnionLocationBadge(browser) {
+    if (browser._onionLocation) {
+      OnionLocationParent.setEnabled(browser);
+      OnionLocationParent.showNotification(browser);
+    } else {
+      OnionLocationParent.setDisabled(browser);
+    }
+  }
+}
diff --git a/browser/components/onionservices/content/onionlocation-notification-icons.css b/browser/components/onionservices/content/onionlocation-notification-icons.css
new file mode 100644
index 000000000000..7c8a6d892c6f
--- /dev/null
+++ b/browser/components/onionservices/content/onionlocation-notification-icons.css
@@ -0,0 +1,5 @@
+/* Copyright (c) 2020, The Tor Project, Inc. */
+
+.onionlocation-notification-icon {
+  display: none;
+}
\ No newline at end of file
diff --git a/browser/components/onionservices/content/onionlocation-urlbar.css b/browser/components/onionservices/content/onionlocation-urlbar.css
new file mode 100644
index 000000000000..91cad5f178d1
--- /dev/null
+++ b/browser/components/onionservices/content/onionlocation-urlbar.css
@@ -0,0 +1,27 @@
+/* Copyright (c) 2020, The Tor Project, Inc. */
+
+#onion-location-button {
+  list-style-image: url(chrome://browser/content/onionservices/onionlocation.svg);
+}
+
+#onion-location-box {
+  border-radius: 3px;
+  background-color: #6200A4;
+  padding-left: 5px;
+  padding-right: 5px;
+  color: white;
+  -moz-context-properties: fill;
+  fill: white;
+}
+
+#onion-location-box:hover {
+  background-color: #0060DF !important;
+}
+
+toolbar[brighttext] #onion-location-box {
+  background-color: #9400ff;
+}
+
+toolbar[brighttext] #onion-location-box:hover {
+  background-color: #0060DF !important;
+}
diff --git a/browser/components/onionservices/content/onionlocation-urlbar.inc.xhtml b/browser/components/onionservices/content/onionlocation-urlbar.inc.xhtml
new file mode 100644
index 000000000000..b612a4236f3c
--- /dev/null
+++ b/browser/components/onionservices/content/onionlocation-urlbar.inc.xhtml
@@ -0,0 +1,10 @@
+# Copyright (c) 2020, The Tor Project, Inc.
+
+<hbox id="onion-location-box"
+      class="urlbar-icon-wrapper urlbar-page-action"
+      role="button"
+      hidden="true"
+      onclick="OnionLocationParent.buttonClick(event);">
+  <image id="onion-location-button" role="presentation"/>
+  <hbox id="onion-label-container"><label id="onion-label"/></hbox>
+</hbox>
diff --git a/browser/components/onionservices/content/onionlocation.svg b/browser/components/onionservices/content/onionlocation.svg
new file mode 100644
index 000000000000..37f40ac1812f
--- /dev/null
+++ b/browser/components/onionservices/content/onionlocation.svg
@@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 16 16" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+  <path fill="context-fill" fill-opacity="context-fill-opacity" d="m8.016411 14.54499v-0.969784c3.071908-0.0089 5.559239-2.501304 5.559239-5.575429 0-3.073903-2.487331-5.566336-5.559239-5.575206v-0.9697843c3.607473 0.00909 6.528802 2.935521 6.528802 6.544991 0 3.609691-2.921329 6.536342-6.528802 6.545213zm0-3.394356c1.732661-0.0091 3.135111-1.415756 3.135111-3.150857 0-1.734878-1.402451-3.141542-3.135111-3.150634v-0.9695626c2.268448 0.00887 4.104895 1.849753 4.104895 4.120197 0 2.270666-1.836447 4.111549-4.104895 4.120419zm0-4.846926c0.9294227 0.00887 1.680545 0.7644289 1.680545 1.696069 0 0.9318627-0.7511226 1.687421-1.680545 1.696291zm-8.016411 1.696069c0 4.418473 3.581527 8.000222 8 8.000222 4.418251 0 8-3.581749 8-8.000222 0-4.418251-3.581749-7.999778-8-7.999778-4.418473 0-8 3.581527-8 7.999778z" />
+</svg>
\ No newline at end of file
diff --git a/browser/components/onionservices/content/onionlocationPreferences.inc.xhtml b/browser/components/onionservices/content/onionlocationPreferences.inc.xhtml
new file mode 100644
index 000000000000..c285f403f99b
--- /dev/null
+++ b/browser/components/onionservices/content/onionlocationPreferences.inc.xhtml
@@ -0,0 +1,11 @@
+# Copyright (c) 2020, The Tor Project, Inc.
+
+<groupbox id="onionServicesGroup" data-category="panePrivacy" data-subcategory="onionservices" hidden="true">
+  <label><html:h2 id="onionServicesTitle"></html:h2></label>
+  <label><label class="tail-with-learn-more" id="prioritizeOnionsDesc"></label><label
+  class="learnMore" is="text-link" id="onionServicesLearnMore"></label></label>
+  <radiogroup id="prioritizeOnionsRadioGroup" aria-labelledby="prioritizeOnionsDesc" preference="privacy.prioritizeonions.enabled">
+    <radio id="onionServicesRadioAlways" value="true"/>
+    <radio id="onionServicesRadioAsk" value="false"/>
+  </radiogroup>
+</groupbox>
diff --git a/browser/components/onionservices/content/onionlocationPreferences.js b/browser/components/onionservices/content/onionlocationPreferences.js
new file mode 100644
index 000000000000..aa569b54721c
--- /dev/null
+++ b/browser/components/onionservices/content/onionlocationPreferences.js
@@ -0,0 +1,31 @@
+// Copyright (c) 2020, The Tor Project, Inc.
+
+"use strict";
+
+ChromeUtils.defineModuleGetter(
+  this,
+  "TorStrings",
+  "resource:///modules/TorStrings.jsm"
+);
+
+const OnionLocationPreferences = {
+  init() {
+    document.getElementById("onionServicesTitle").textContent =
+      TorStrings.onionLocation.onionServicesTitle;
+    document.getElementById("prioritizeOnionsDesc").textContent =
+      TorStrings.onionLocation.prioritizeOnionsDescription;
+    const learnMore = document.getElementById("onionServicesLearnMore");
+    learnMore.textContent = TorStrings.onionLocation.learnMore;
+    learnMore.href = TorStrings.onionLocation.learnMoreURL;
+    document.getElementById("onionServicesRadioAlways").label =
+      TorStrings.onionLocation.always;
+    document.getElementById("onionServicesRadioAsk").label =
+      TorStrings.onionLocation.askEverytime;
+  },
+};
+
+Object.defineProperty(this, "OnionLocationPreferences", {
+  value: OnionLocationPreferences,
+  enumerable: true,
+  writable: false,
+});
diff --git a/browser/components/onionservices/jar.mn b/browser/components/onionservices/jar.mn
index 9d6ce88d1841..f45b16dc5d29 100644
--- a/browser/components/onionservices/jar.mn
+++ b/browser/components/onionservices/jar.mn
@@ -7,3 +7,5 @@ browser.jar:
     content/browser/onionservices/onionservices.css                (content/onionservices.css)
     content/browser/onionservices/savedKeysDialog.js               (content/savedKeysDialog.js)
     content/browser/onionservices/savedKeysDialog.xhtml            (content/savedKeysDialog.xhtml)
+    content/browser/onionservices/onionlocationPreferences.js      (content/onionlocationPreferences.js)
+    content/browser/onionservices/onionlocation.svg                (content/onionlocation.svg)
diff --git a/browser/components/onionservices/moz.build b/browser/components/onionservices/moz.build
index 815685322024..8027233d65a6 100644
--- a/browser/components/onionservices/moz.build
+++ b/browser/components/onionservices/moz.build
@@ -4,4 +4,6 @@ EXTRA_JS_MODULES += [
     "ExtensionMessaging.jsm",
     "HttpsEverywhereControl.jsm",
     "OnionAliasStore.jsm",
+    "OnionLocationChild.jsm",
+    "OnionLocationParent.jsm",
 ]
diff --git a/browser/components/preferences/privacy.inc.xhtml b/browser/components/preferences/privacy.inc.xhtml
index eb410c13a8cc..be629399bdb9 100644
--- a/browser/components/preferences/privacy.inc.xhtml
+++ b/browser/components/preferences/privacy.inc.xhtml
@@ -14,6 +14,8 @@
   <html:h1 data-l10n-id="privacy-header"/>
 </hbox>
 
+#include ../onionservices/content/onionlocationPreferences.inc.xhtml
+
 <!-- Tracking / Content Blocking -->
 <groupbox id="trackingGroup" data-category="panePrivacy" hidden="true" aria-describedby="contentBlockingDescription">
   <label id="contentBlockingHeader"><html:h2 data-l10n-id="content-blocking-enhanced-tracking-protection"/></label>
diff --git a/browser/components/preferences/privacy.js b/browser/components/preferences/privacy.js
index 0b1e28dfac92..290b22271807 100644
--- a/browser/components/preferences/privacy.js
+++ b/browser/components/preferences/privacy.js
@@ -93,6 +93,12 @@ XPCOMUtils.defineLazyScriptGetter(
   "chrome://browser/content/securitylevel/securityLevel.js"
 );
 
+XPCOMUtils.defineLazyScriptGetter(
+  this,
+  ["OnionLocationPreferences"],
+  "chrome://browser/content/onionservices/onionlocationPreferences.js"
+);
+
 XPCOMUtils.defineLazyServiceGetter(
   this,
   "listManager",
@@ -169,6 +175,9 @@ Preferences.addAll([
   // Do not track
   { id: "privacy.donottrackheader.enabled", type: "bool" },
 
+  // Onion Location
+  { id: "privacy.prioritizeonions.enabled", type: "bool" },
+
   // Media
   { id: "media.autoplay.default", type: "int" },
 
@@ -330,6 +339,13 @@ var gPrivacyPane = {
     window.addEventListener("unload", unload);
   },
 
+  /**
+   * Show the OnionLocation preferences UI
+   */
+  _initOnionLocation() {
+    OnionLocationPreferences.init();
+  },
+
   /**
    * Whether the prompt to restart Firefox should appear when changing the autostart pref.
    */
@@ -537,6 +553,7 @@ var gPrivacyPane = {
     this._initTrackingProtectionExtensionControl();
     OnionServicesAuthPreferences.init();
     this._initSecurityLevel();
+    this._initOnionLocation();
 
     Services.telemetry.setEventRecordingEnabled("pwmgr", true);
 
diff --git a/browser/themes/shared/notification-icons.inc.css b/browser/themes/shared/notification-icons.inc.css
index 39eb59a04964..0312654b6bcf 100644
--- a/browser/themes/shared/notification-icons.inc.css
+++ b/browser/themes/shared/notification-icons.inc.css
@@ -536,3 +536,5 @@
   border-radius: 50%;
 }
 } /** END not Proton **/
+
+%include ../../components/onionservices/content/onionlocation-notification-icons.css
diff --git a/browser/themes/shared/urlbar-searchbar.inc.css b/browser/themes/shared/urlbar-searchbar.inc.css
index 89e77b8ce90a..dc608af4b7fa 100644
--- a/browser/themes/shared/urlbar-searchbar.inc.css
+++ b/browser/themes/shared/urlbar-searchbar.inc.css
@@ -904,3 +904,5 @@ moz-input-box > menupopup .context-menu-add-engine > .menu-iconic-left::after {
   opacity: 0.69;
 }
 } /*** END !proton ***/
+
+%include ../../components/onionservices/content/onionlocation-urlbar.css
diff --git a/dom/base/Document.cpp b/dom/base/Document.cpp
index c0494f7ccc74..c5592ec6bcbd 100644
--- a/dom/base/Document.cpp
+++ b/dom/base/Document.cpp
@@ -2781,6 +2781,7 @@ void Document::ResetToURI(nsIURI* aURI, nsILoadGroup* aLoadGroup,
   // mDocumentURI.
   mDocumentBaseURI = nullptr;
   mChromeXHRDocBaseURI = nullptr;
+  mOnionLocationURI = nullptr;
 
   // Check if the current document is the top-level DevTools document.
   // For inner DevTools frames, mIsDevToolsDocument will be set when
@@ -6498,6 +6499,22 @@ void Document::GetHeaderData(nsAtom* aHeaderField, nsAString& aData) const {
   }
 }
 
+static bool IsValidOnionLocation(nsIURI* aDocumentURI,
+                                 nsIURI* aOnionLocationURI) {
+  bool isHttpish;
+  nsAutoCString host;
+  return aDocumentURI && aOnionLocationURI &&
+         NS_SUCCEEDED(aDocumentURI->SchemeIs("https", &isHttpish)) &&
+         isHttpish && NS_SUCCEEDED(aDocumentURI->GetAsciiHost(host)) &&
+         !StringEndsWith(host, ".onion"_ns) &&
+         ((NS_SUCCEEDED(aOnionLocationURI->SchemeIs("http", &isHttpish)) &&
+           isHttpish) ||
+          (NS_SUCCEEDED(aOnionLocationURI->SchemeIs("https", &isHttpish)) &&
+           isHttpish)) &&
+         NS_SUCCEEDED(aOnionLocationURI->GetAsciiHost(host)) &&
+         StringEndsWith(host, ".onion"_ns);
+}
+
 void Document::SetHeaderData(nsAtom* aHeaderField, const nsAString& aData) {
   if (!aHeaderField) {
     NS_ERROR("null headerField");
@@ -6572,6 +6589,21 @@ void Document::SetHeaderData(nsAtom* aHeaderField, const nsAString& aData) {
       aHeaderField == nsGkAtoms::handheldFriendly) {
     mViewportType = Unknown;
   }
+
+  if (aHeaderField == nsGkAtoms::headerOnionLocation && !aData.IsEmpty()) {
+    nsCOMPtr<nsIURI> onionURI;
+    if (NS_SUCCEEDED(NS_NewURI(getter_AddRefs(onionURI), aData)) &&
+        IsValidOnionLocation(Document::GetDocumentURI(), onionURI)) {
+      if (StaticPrefs::privacy_prioritizeonions_enabled()) {
+        nsCOMPtr<nsIRefreshURI> refresher(mDocumentContainer);
+        if (refresher) {
+          refresher->RefreshURI(onionURI, NodePrincipal(), 0, false, true);
+        }
+      } else {
+        mOnionLocationURI = onionURI;
+      }
+    }
+  }
 }
 
 void Document::TryChannelCharset(nsIChannel* aChannel, int32_t& aCharsetSource,
@@ -10681,7 +10713,7 @@ void Document::RetrieveRelevantHeaders(nsIChannel* aChannel) {
     static const char* const headers[] = {
         "default-style", "content-style-type", "content-language",
         "content-disposition", "refresh", "x-dns-prefetch-control",
-        "x-frame-options",
+        "x-frame-options", "onion-location",
         // add more http headers if you need
         // XXXbz don't add content-location support without reading bug
         // 238654 and its dependencies/dups first.
diff --git a/dom/base/Document.h b/dom/base/Document.h
index 619484ceb2d0..18c28e40ed76 100644
--- a/dom/base/Document.h
+++ b/dom/base/Document.h
@@ -3374,6 +3374,7 @@ class Document : public nsINode,
   void ReleaseCapture() const;
   void MozSetImageElement(const nsAString& aImageElementId, Element* aElement);
   nsIURI* GetDocumentURIObject() const;
+  nsIURI* GetOnionLocationURI() const { return mOnionLocationURI; }
   // Not const because all the fullscreen goop is not const
   const char* GetFullscreenError(CallerType);
   bool FullscreenEnabled(CallerType aCallerType) {
@@ -4360,6 +4361,7 @@ class Document : public nsINode,
   nsCOMPtr<nsIURI> mChromeXHRDocURI;
   nsCOMPtr<nsIURI> mDocumentBaseURI;
   nsCOMPtr<nsIURI> mChromeXHRDocBaseURI;
+  nsCOMPtr<nsIURI> mOnionLocationURI;
 
   // The base domain of the document for third-party checks.
   nsCString mBaseDomain;
diff --git a/dom/webidl/Document.webidl b/dom/webidl/Document.webidl
index 23a8f6a038b2..a3d06fb8e4be 100644
--- a/dom/webidl/Document.webidl
+++ b/dom/webidl/Document.webidl
@@ -717,3 +717,11 @@ partial interface Document {
   [ChromeOnly]
   void setNotifyFormOrPasswordRemoved(boolean aShouldNotify);
 };
+
+/**
+ * Extension to allows chrome JS to know whether the document has a valid
+ * Onion-Location that we could redirect to.
+ */
+partial interface Document {
+  [ChromeOnly] readonly attribute URI? onionLocationURI;
+};
diff --git a/modules/libpref/init/StaticPrefList.yaml b/modules/libpref/init/StaticPrefList.yaml
index 238177c47894..0c8ea070ed45 100644
--- a/modules/libpref/init/StaticPrefList.yaml
+++ b/modules/libpref/init/StaticPrefList.yaml
@@ -10296,6 +10296,11 @@
   value: ""
   mirror: never
 
+- name: privacy.prioritizeonions.enabled
+  type: RelaxedAtomicBool
+  value: false
+  mirror: always
+
 #---------------------------------------------------------------------------
 # Prefs starting with "prompts."
 #---------------------------------------------------------------------------
diff --git a/xpcom/ds/StaticAtoms.py b/xpcom/ds/StaticAtoms.py
index 0cc7799d4370..09a91aee3f2a 100644
--- a/xpcom/ds/StaticAtoms.py
+++ b/xpcom/ds/StaticAtoms.py
@@ -818,6 +818,7 @@ STATIC_ATOMS = [
     Atom("oninputsourceschange", "oninputsourceschange"),
     Atom("oninstall", "oninstall"),
     Atom("oninvalid", "oninvalid"),
+    Atom("headerOnionLocation", "onion-location"),
     Atom("onkeydown", "onkeydown"),
     Atom("onkeypress", "onkeypress"),
     Atom("onkeyup", "onkeyup"),
                    
                  
                  
                          
                            
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                            [tor-browser/tor-browser-90.0b12-10.5-1] Bug 32418: Allow updates to be disabled via an enterprise policy.
                        
                        
by sysrqb@torproject.org 02 Jul '21
                    by sysrqb@torproject.org 02 Jul '21
02 Jul '21
                    
                        commit 6d965bc1af6a1231e3c6181e348c125f2e16009a
Author: Kathy Brade <brade(a)pearlcrescent.com>
Date:   Thu Apr 16 17:07:09 2020 -0400
    Bug 32418: Allow updates to be disabled via an enterprise policy.
    
    Restrict the Enterprise Policies mechanism to only consult a
    policies.json file (avoiding the Windows Registry and macOS's
    file system attributes).
    
    Add a few disabledByPolicy() checks to the update service to
    avoid extraneous (and potentially confusing) log messages when
    updates are disabled by policy.
    
    Sample content for distribution/policies.json:
    {
      "policies": {
        "DisableAppUpdate": true
      }
    }
    
    On Linux, avoid reading policies from /etc/firefox/policies/policies.json
---
 .../enterprisepolicies/EnterprisePoliciesParent.jsm        | 14 ++++++++++++--
 toolkit/components/enterprisepolicies/moz.build            |  3 +++
 2 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/toolkit/components/enterprisepolicies/EnterprisePoliciesParent.jsm b/toolkit/components/enterprisepolicies/EnterprisePoliciesParent.jsm
index 775144e8a649..9fe916236cbc 100644
--- a/toolkit/components/enterprisepolicies/EnterprisePoliciesParent.jsm
+++ b/toolkit/components/enterprisepolicies/EnterprisePoliciesParent.jsm
@@ -4,6 +4,10 @@
 
 var EXPORTED_SYMBOLS = ["EnterprisePoliciesManager"];
 
+// To ensure that policies intended for Firefox or another browser will not
+// be used, Tor Browser only looks for policies in ${InstallDir}/distribution
+#define AVOID_SYSTEM_POLICIES MOZ_PROXY_BYPASS_PROTECTION
+
 const { XPCOMUtils } = ChromeUtils.import(
   "resource://gre/modules/XPCOMUtils.jsm"
 );
@@ -13,9 +17,11 @@ const { AppConstants } = ChromeUtils.import(
 );
 
 XPCOMUtils.defineLazyModuleGetters(this, {
+#ifndef AVOID_SYSTEM_POLICIES
   WindowsGPOParser: "resource://gre/modules/policies/WindowsGPOParser.jsm",
   macOSPoliciesParser:
     "resource://gre/modules/policies/macOSPoliciesParser.jsm",
+#endif
   Policies: "resource:///modules/policies/Policies.jsm",
   JsonSchemaValidator:
     "resource://gre/modules/components-utils/JsonSchemaValidator.jsm",
@@ -140,11 +146,13 @@ EnterprisePoliciesManager.prototype = {
 
   _chooseProvider() {
     let platformProvider = null;
+#ifndef AVOID_SYSTEM_POLICIES
     if (AppConstants.platform == "win") {
       platformProvider = new WindowsGPOPoliciesProvider();
     } else if (AppConstants.platform == "macosx") {
       platformProvider = new macOSPoliciesProvider();
     }
+#endif
     let jsonProvider = new JSONPoliciesProvider();
     if (platformProvider && platformProvider.hasPolicies) {
       if (jsonProvider.hasPolicies) {
@@ -491,7 +499,7 @@ class JSONPoliciesProvider {
 
   _getConfigurationFile() {
     let configFile = null;
-
+#ifndef AVOID_SYSTEM_POLICIES
     if (AppConstants.platform == "linux") {
       let systemConfigFile = Cc["@mozilla.org/file/local;1"].createInstance(
         Ci.nsIFile
@@ -504,7 +512,7 @@ class JSONPoliciesProvider {
         return systemConfigFile;
       }
     }
-
+#endif
     try {
       let perUserPath = Services.prefs.getBoolPref(PREF_PER_USER_DIR, false);
       if (perUserPath) {
@@ -585,6 +593,7 @@ class JSONPoliciesProvider {
   }
 }
 
+#ifndef AVOID_SYSTEM_POLICIES
 class WindowsGPOPoliciesProvider {
   constructor() {
     this._policies = null;
@@ -686,3 +695,4 @@ class CombinedProvider {
     return false;
   }
 }
+#endif
diff --git a/toolkit/components/enterprisepolicies/moz.build b/toolkit/components/enterprisepolicies/moz.build
index 09d2046e1bd7..3f685d3fbbd6 100644
--- a/toolkit/components/enterprisepolicies/moz.build
+++ b/toolkit/components/enterprisepolicies/moz.build
@@ -19,6 +19,9 @@ if CONFIG["MOZ_WIDGET_TOOLKIT"] != "android":
     EXTRA_JS_MODULES += [
         "EnterprisePolicies.jsm",
         "EnterprisePoliciesContent.jsm",
+    ]
+
+    EXTRA_PP_JS_MODULES += [
         "EnterprisePoliciesParent.jsm",
     ]
 
                    
                  
                  
                          
                            
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                            [tor-browser/tor-browser-90.0b12-10.5-1] Bug 30605: Honor privacy.spoof_english in Android
                        
                        
by sysrqb@torproject.org 02 Jul '21
                    by sysrqb@torproject.org 02 Jul '21
02 Jul '21
                    
                        commit 7017ce4bf730f179e1a0fd8191cff26e6abef1da
Author: Alex Catarineu <acat(a)torproject.org>
Date:   Fri Oct 16 10:45:17 2020 +0200
    Bug 30605: Honor privacy.spoof_english in Android
    
    This checks `privacy.spoof_english` whenever `setLocales` is
    called from Fenix side and sets `intl.accept_languages`
    accordingly.
---
 mobile/android/components/geckoview/GeckoViewStartup.jsm | 5 +++++
 1 file changed, 5 insertions(+)
diff --git a/mobile/android/components/geckoview/GeckoViewStartup.jsm b/mobile/android/components/geckoview/GeckoViewStartup.jsm
index 3603c3743fa1..b73a5f4f0978 100644
--- a/mobile/android/components/geckoview/GeckoViewStartup.jsm
+++ b/mobile/android/components/geckoview/GeckoViewStartup.jsm
@@ -17,6 +17,7 @@ XPCOMUtils.defineLazyModuleGetters(this, {
   EventDispatcher: "resource://gre/modules/Messaging.jsm",
   Preferences: "resource://gre/modules/Preferences.jsm",
   Services: "resource://gre/modules/Services.jsm",
+  RFPHelper: "resource://gre/modules/RFPHelper.jsm",
 });
 
 const { debug, warn } = GeckoViewUtils.initLogging("Startup");
@@ -252,6 +253,10 @@ class GeckoViewStartup {
         if (aData.requestedLocales) {
           Services.locale.requestedLocales = aData.requestedLocales;
         }
+        RFPHelper._handleSpoofEnglishChanged();
+        if (Services.prefs.getIntPref("privacy.spoof_english", 0) === 2) {
+          break;
+        }
         const pls = Cc["@mozilla.org/pref-localizedstring;1"].createInstance(
           Ci.nsIPrefLocalizedString
         );
                    
                  
                  
                          
                            
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                            [tor-browser/tor-browser-90.0b12-10.5-1] Bug 33852: Clean up about:logins (LockWise) to avoid mentioning sync, etc.
                        
                        
by sysrqb@torproject.org 02 Jul '21
                    by sysrqb@torproject.org 02 Jul '21
02 Jul '21
                    
                        commit eb7df091bdd8a2899982187d1286aa307f3e2444
Author: Kathy Brade <brade(a)pearlcrescent.com>
Date:   Tue Jul 14 11:15:07 2020 -0400
    Bug 33852: Clean up about:logins (LockWise) to avoid mentioning sync, etc.
    
    Hide elements on about:logins that mention sync, "Firefox LockWise", and
    Mozilla's LockWise mobile apps.
    
    Disable the "Create New Login" button when security.nocertdb is true.
---
 browser/components/aboutlogins/AboutLoginsParent.jsm           |  2 ++
 browser/components/aboutlogins/content/aboutLogins.css         |  8 +++++++-
 browser/components/aboutlogins/content/aboutLogins.js          |  6 ++++++
 .../aboutlogins/content/components/fxaccounts-button.css       |  5 +++++
 .../components/aboutlogins/content/components/menu-button.css  | 10 ++++++++++
 5 files changed, 30 insertions(+), 1 deletion(-)
diff --git a/browser/components/aboutlogins/AboutLoginsParent.jsm b/browser/components/aboutlogins/AboutLoginsParent.jsm
index db0b55d26abc..39fd2356ce99 100644
--- a/browser/components/aboutlogins/AboutLoginsParent.jsm
+++ b/browser/components/aboutlogins/AboutLoginsParent.jsm
@@ -61,6 +61,7 @@ XPCOMUtils.defineLazyGetter(this, "AboutLoginsL10n", () => {
 
 const ABOUT_LOGINS_ORIGIN = "about:logins";
 const MASTER_PASSWORD_NOTIFICATION_ID = "master-password-login-required";
+const NOCERTDB_PREF = "security.nocertdb";
 
 // about:logins will always use the privileged content process,
 // even if it is disabled for other consumers such as about:newtab.
@@ -273,6 +274,7 @@ class AboutLoginsParent extends JSWindowActorParent {
             importVisible:
               Services.policies.isAllowed("profileImport") &&
               AppConstants.platform != "linux",
+            canCreateLogins: !Services.prefs.getBoolPref(NOCERTDB_PREF, false),
           });
 
           await AboutLogins._sendAllLoginRelatedObjects(
diff --git a/browser/components/aboutlogins/content/aboutLogins.css b/browser/components/aboutlogins/content/aboutLogins.css
index e3528ca49b84..eaa224178487 100644
--- a/browser/components/aboutlogins/content/aboutLogins.css
+++ b/browser/components/aboutlogins/content/aboutLogins.css
@@ -69,6 +69,11 @@ login-item {
   grid-area: login;
 }
 
+/* Do not promote Mozilla Sync in Tor Browser. */
+login-intro {
+  display: none !important;
+}
+
 #branding-logo {
   flex-basis: var(--sidebar-width);
   flex-shrink: 0;
@@ -83,7 +88,8 @@ login-item {
   }
 }
 
-:root:not(.official-branding) #branding-logo {
+/* Hide "Firefox LockWise" branding in Tor Browser. */
+#branding-logo {
   visibility: hidden;
 }
 
diff --git a/browser/components/aboutlogins/content/aboutLogins.js b/browser/components/aboutlogins/content/aboutLogins.js
index a7449f8343b3..f288fb6988fb 100644
--- a/browser/components/aboutlogins/content/aboutLogins.js
+++ b/browser/components/aboutlogins/content/aboutLogins.js
@@ -22,6 +22,9 @@ const gElements = {
       ".menuitem-remove-all-logins"
     );
   },
+  get createNewLoginButton() {
+    return this.loginList.shadowRoot.querySelector(".create-login-button");
+  },
 };
 
 let numberOfLogins = 0;
@@ -111,6 +114,9 @@ window.addEventListener("AboutLoginsChromeToContent", event => {
       gElements.loginList.setSortDirection(event.detail.value.selectedSort);
       document.documentElement.classList.add("initialized");
       gElements.loginList.classList.add("initialized");
+      if (!event.detail.value.canCreateLogins) {
+        gElements.createNewLoginButton.disabled = true;
+      }
       break;
     }
     case "ShowLoginItemError": {
diff --git a/browser/components/aboutlogins/content/components/fxaccounts-button.css b/browser/components/aboutlogins/content/components/fxaccounts-button.css
index c8925f6fc75d..55c2a8810fa1 100644
--- a/browser/components/aboutlogins/content/components/fxaccounts-button.css
+++ b/browser/components/aboutlogins/content/components/fxaccounts-button.css
@@ -8,6 +8,11 @@
   align-items: center;
 }
 
+/* Do not promote Mozilla Sync in Tor Browser. */
+.logged-out-view {
+  display: none !important;
+}
+
 .fxaccounts-extra-text {
   /* Only show at most 3 lines of text to limit the
      text from overflowing the header. */
diff --git a/browser/components/aboutlogins/content/components/menu-button.css b/browser/components/aboutlogins/content/components/menu-button.css
index 6bc14f7892fa..22a06e3727ed 100644
--- a/browser/components/aboutlogins/content/components/menu-button.css
+++ b/browser/components/aboutlogins/content/components/menu-button.css
@@ -91,3 +91,13 @@
 .menuitem-preferences {
   background-image: url("chrome://global/skin/icons/settings.svg");
 }
+
+/*
+ * Do not promote LockWise mobile apps in Tor Browser: hide the menu items
+ * and the separator line that precedes them.
+ */
+.menuitem-mobile-android,
+.menuitem-mobile-ios,
+button[data-event-name="AboutLoginsGetHelp"] + hr {
+  display: none !important;
+}
                    
                  
                  
                          
                            
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                            [tor-browser/tor-browser-90.0b12-10.5-1] Bug 40002: Remove about:ion
                        
                        
by sysrqb@torproject.org 02 Jul '21
                    by sysrqb@torproject.org 02 Jul '21
02 Jul '21
                    
                        commit 134d6fa567dd0a99a11bbd913d0c4bcafb067237
Author: Kathy Brade <brade(a)pearlcrescent.com>
Date:   Fri Aug 14 09:06:33 2020 -0400
    Bug 40002: Remove about:ion
    
    Firefox Ion (previously Firefox Pioneer) is an opt-in program in which people
    volunteer to participate in studies that collect detailed, sensitive data about
    how they use their browser.
---
 browser/components/about/AboutRedirector.cpp | 2 --
 browser/components/about/components.conf     | 1 -
 2 files changed, 3 deletions(-)
diff --git a/browser/components/about/AboutRedirector.cpp b/browser/components/about/AboutRedirector.cpp
index e6cf3fe0ef9f..323c1b6fb653 100644
--- a/browser/components/about/AboutRedirector.cpp
+++ b/browser/components/about/AboutRedirector.cpp
@@ -122,8 +122,6 @@ static const RedirEntry kRedirMap[] = {
          nsIAboutModule::HIDE_FROM_ABOUTABOUT},
     {"restartrequired", "chrome://browser/content/aboutRestartRequired.xhtml",
      nsIAboutModule::ALLOW_SCRIPT | nsIAboutModule::HIDE_FROM_ABOUTABOUT},
-    {"ion", "chrome://browser/content/ion.html",
-     nsIAboutModule::ALLOW_SCRIPT | nsIAboutModule::HIDE_FROM_ABOUTABOUT},
 #ifdef TOR_BROWSER_UPDATE
     {"tbupdate", "chrome://browser/content/abouttbupdate/aboutTBUpdate.xhtml",
      nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT |
diff --git a/browser/components/about/components.conf b/browser/components/about/components.conf
index faf6107d6fa6..67f178ee23ff 100644
--- a/browser/components/about/components.conf
+++ b/browser/components/about/components.conf
@@ -13,7 +13,6 @@ pages = [
     'logins',
     'loginsimportreport',
     'newtab',
-    'ion',
     'pocket-home',
     'pocket-saved',
     'pocket-signup',
                    
                  
                  
                          
                            
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                            [tor-browser/tor-browser-90.0b12-10.5-1] Bug 40025: Remove Mozilla add-on install permissions
                        
                        
by sysrqb@torproject.org 02 Jul '21
                    by sysrqb@torproject.org 02 Jul '21
02 Jul '21
                    
                        commit 8a1de16d05039fd5f4709a76ba09638ff2ea8411
Author: Alex Catarineu <acat(a)torproject.org>
Date:   Mon Jul 27 18:12:55 2020 +0200
    Bug 40025: Remove Mozilla add-on install permissions
---
 browser/app/permissions | 5 -----
 1 file changed, 5 deletions(-)
diff --git a/browser/app/permissions b/browser/app/permissions
index 79b6aa6505bd..2cae334be9b4 100644
--- a/browser/app/permissions
+++ b/browser/app/permissions
@@ -12,11 +12,6 @@
 origin	uitour	1	https://3g2upl4pq6kufc4m.onion
 origin	uitour	1	about:tor
 
-# XPInstall
-origin	install	1	https://addons.mozilla.org
-
 # Remote troubleshooting
 origin	remote-troubleshooting	1	https://support.mozilla.org
 
-# addon install
-origin	install	1	https://fpn.firefox.com
                    
                  
                  
                          
                            
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