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richard pushed a commit to branch tor-browser-91.13.0esr-11.5-1 in repository tor-browser.

commit 98092c13247a01d45ee0dcc94d686ca5edbe672c Author: hackademix giorgio@maone.net AuthorDate: Thu Nov 10 22:25:51 2022 +0100

Bug 41434: Letterboxing, preemptively apply margins in a global CSS rule to mitigate race conditions on newly created windows and tabs. --- browser/base/content/browser.css | 12 ++ .../components/resistfingerprinting/RFPHelper.jsm | 178 ++++++++++++++------- 2 files changed, 129 insertions(+), 61 deletions(-)

diff --git a/browser/base/content/browser.css b/browser/base/content/browser.css index 2d74162b1543..b1aef1309784 100644 --- a/browser/base/content/browser.css +++ b/browser/base/content/browser.css @@ -94,6 +94,18 @@ body { } }

+/** + Never modify the following selector without synchronizing + LETTERBOX_CSS_SELECTOR in RFPHelper.jsm! +**/ +.letterboxing .browserStack > browser:not(.exclude-letterboxing) { + margin: 0; /* to be dynamically set by RFHelper.jsm */ +} + +browser.exclude-letterboxing { + margin: 0 !important; +} + %ifdef MENUBAR_CAN_AUTOHIDE #toolbar-menubar[autohide="true"] { overflow: hidden; diff --git a/toolkit/components/resistfingerprinting/RFPHelper.jsm b/toolkit/components/resistfingerprinting/RFPHelper.jsm index 166ad21e9013..449cbced7d57 100644 --- a/toolkit/components/resistfingerprinting/RFPHelper.jsm +++ b/toolkit/components/resistfingerprinting/RFPHelper.jsm @@ -107,7 +107,7 @@ class _RFPHelper { switch (aMessage.type) { case "TabOpen": { let tab = aMessage.target; - this._addOrClearContentMargin(tab.linkedBrowser); + this._addOrClearContentMargin(tab.linkedBrowser, /* isNewTab = */ true); break; } default: @@ -361,20 +361,49 @@ class _RFPHelper { }); }

- _addOrClearContentMargin(aBrowser) { - let tab = aBrowser.getTabBrowser().getTabForBrowser(aBrowser); + getLetterboxingDefaultRule(aBrowser) { + let document = aBrowser.ownerDocument; + return (document._letterboxingMarginsRule ||= (() => { + // If not already cached on the document object, traverse the CSSOM and + // find the rule applying the default letterboxing styles to browsers + // preemptively in order to beat race conditions on tab/window creation + const LETTERBOX_CSS_URL = "chrome://browser/content/browser.css"; + const LETTERBOX_CSS_SELECTOR = + ".letterboxing .browserStack > browser:not(.exclude-letterboxing)"; + for (let ss of document.styleSheets) { + if (ss.href !== LETTERBOX_CSS_URL) { + continue; + } + for (let rule of ss.rules) { + if (rule.selectorText === LETTERBOX_CSS_SELECTOR) { + return rule; + } + } + } + return null; // shouldn't happen + })()); + }

+ _noLetterBoxingFor({ contentPrincipal, currentURI }) { + // we don't want letterboxing on... + return ( + // ... privileged pages + contentPrincipal.isSystemPrincipal || + // ... about: URIs EXCEPT about:blank + (currentURI.schemeIs("about") && currentURI.filePath !== "blank") + ); + } + + _addOrClearContentMargin(aBrowser, isNewTab = false) { // We won't do anything for lazy browsers. if (!aBrowser.isConnected) { return; } - - // We should apply no margin around an empty tab or a tab with system - // principal. - if (tab.isEmpty || aBrowser.contentPrincipal.isSystemPrincipal) { + if (this._noLetterBoxingFor(aBrowser)) { + // this tab doesn't need letterboxing this._clearContentViewMargin(aBrowser); } else { - this._roundContentView(aBrowser); + this._roundContentView(aBrowser, isNewTab); } }

@@ -400,44 +429,25 @@ class _RFPHelper { * The function will round the given browser by adding margins around the * content viewport. */ - async _roundContentView(aBrowser) { + async _roundContentView(aBrowser, isNewTab = false) { let logId = Math.random(); log("_roundContentView[" + logId + "]"); + aBrowser.classList.remove("exclude-letterboxing"); let win = aBrowser.ownerGlobal; let browserContainer = aBrowser .getTabBrowser() .getBrowserContainer(aBrowser); - - let { - contentWidth, - contentHeight, - containerWidth, - containerHeight, - } = await win.promiseDocumentFlushed(() => { - let contentWidth = aBrowser.clientWidth; - let contentHeight = aBrowser.clientHeight; - let containerWidth = browserContainer.clientWidth; - let containerHeight = browserContainer.clientHeight; - - // If the findbar or devtools are out, we need to subtract their height (plus 1 - // for the separator) from the container height, because we need to adjust our - // letterboxing to account for it; however it is not included in that dimension - // (but rather is subtracted from the content height.) - let findBar = win.gFindBarInitialized ? win.gFindBar : undefined; - let findBarOffset = - findBar && !findBar.hidden ? findBar.clientHeight + 1 : 0; - let devtools = browserContainer.getElementsByClassName( - "devtools-toolbox-bottom-iframe" - ); - let devtoolsOffset = devtools.length ? devtools[0].clientHeight : 0; - - return { - contentWidth, - contentHeight, - containerWidth, - containerHeight: containerHeight - findBarOffset - devtoolsOffset, - }; - }); + let browserParent = aBrowser.parentElement; + let [ + [contentWidth, contentHeight], + [parentWidth, parentHeight], + [containerWidth, containerHeight], + ] = await win.promiseDocumentFlushed(() => + // Read layout info only inside this callback and do not write, to avoid additional reflows + [aBrowser, browserParent, browserContainer] + .map(e => e.getBoundingClientRect()) + .map(r => [r.width, r.height]) + );

log( "_roundContentView[" + @@ -453,7 +463,12 @@ class _RFPHelper { " " );

- let calcMargins = (aWidth, aHeight) => { + if (containerWidth === 0) { + // race condition: tab already be closed, bail out + return; + } + + const calcMargins = (aWidth, aHeight) => { let result; log( "_roundContentView[" + @@ -464,6 +479,7 @@ class _RFPHelper { aHeight + ")" ); + // If the set is empty, we will round the content with the default // stepping size. if (!this._letterboxingDimensions.length) { @@ -539,10 +555,54 @@ class _RFPHelper { // Calculating the margins around the browser element in order to round the // content viewport. We will use a 200x100 stepping if the dimension set // is not given. - let margins = calcMargins(containerWidth, containerHeight); + + const buildMarginStyleString = (aWidth, aHeight) => { + const marginDims = calcMargins(aWidth, aHeight); + + // snap browser element to top + const top = 0, + // and leave 'double' margin at the bottom + bottom = 2 * marginDims.height, + // identical margins left and right + left = marginDims.width, + right = marginDims.width; + + return `${top}px ${right}px ${bottom}px ${left}px`; + }; + + const marginChanges = Object.assign([], { + queueIfNeeded({ style }, margin) { + if (style.margin !== margin) { + this.push(() => { + style.margin = margin; + }); + } + }, + perform() { + win.requestAnimationFrame(() => { + for (let change of this) { + change(); + } + }); + }, + }); + + marginChanges.queueIfNeeded( + this.getLetterboxingDefaultRule(aBrowser), + buildMarginStyleString(containerWidth, containerHeight) + ); + + const marginStyleString = + !isNewTab && // new tabs cannot have extra UI components + (containerHeight > parentHeight || containerWidth > parentWidth) + ? // optional UI components such as the notification box, the find bar + // or devtools are constraining this browser's size: recompute custom + buildMarginStyleString(parentWidth, parentHeight) + : ""; // otherwise we can keep the default letterboxing margins + marginChanges.queueIfNeeded(aBrowser, marginStyleString);

// If the size of the content is already quantized, we do nothing. - if (aBrowser.style.margin == `${margins.height}px ${margins.width}px`) { + if (!marginChanges.length) { log("_roundContentView[" + logId + "] is_rounded == true"); if (this._isLetterboxingTesting) { log( @@ -558,31 +618,24 @@ class _RFPHelper { return; }

- win.requestAnimationFrame(() => { - log( - "_roundContentView[" + - logId + - "] setting margins to " + - margins.width + - " x " + - margins.height - ); - // One cannot (easily) control the color of a margin unfortunately. - // An initial attempt to use a border instead of a margin resulted - // in offset event dispatching; so for now we use a colorless margin. - aBrowser.style.margin = `${margins.height}px ${margins.width}px`; - }); + log( + "_roundContentView[" + logId + "] setting margins to " + marginStyleString + ); + // One cannot (easily) control the color of a margin unfortunately. + // An initial attempt to use a border instead of a margin resulted + // in offset event dispatching; so for now we use a colorless margin. + marginChanges.perform(); }

_clearContentViewMargin(aBrowser) { - aBrowser.ownerGlobal.requestAnimationFrame(() => { - aBrowser.style.margin = ""; - }); + aBrowser.classList.add("exclude-letterboxing"); }

_updateMarginsForTabsInWindow(aWindow) { let tabBrowser = aWindow.gBrowser;

+ tabBrowser.tabpanels?.classList.add("letterboxing"); + for (let tab of tabBrowser.tabs) { let browser = tab.linkedBrowser; this._addOrClearContentMargin(browser); @@ -616,7 +669,10 @@ class _RFPHelper { tabBrowser.removeTabsProgressListener(this); aWindow.removeEventListener("TabOpen", this);

- // Clear all margins and tooltip for all browsers. + // revert tabpanel's style to default + tabBrowser.tabpanels?.classList.remove("letterboxing"); + + // and restore default margins on each browser element for (let tab of tabBrowser.tabs) { let browser = tab.linkedBrowser; this._clearContentViewMargin(browser);

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richard pushed a commit to branch tor-browser-91.13.0esr-11.5-1 in repository tor-browser.

commit 763af12046244e254f0880932223dd8028327022 Author: hackademix giorgio@maone.net AuthorDate: Thu Nov 10 23:02:47 2022 +0100

Bug 31064: Letterboxing, exempt browser extensions. --- toolkit/components/resistfingerprinting/RFPHelper.jsm | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/toolkit/components/resistfingerprinting/RFPHelper.jsm b/toolkit/components/resistfingerprinting/RFPHelper.jsm index 7dccf684d585..15d90a068bf3 100644 --- a/toolkit/components/resistfingerprinting/RFPHelper.jsm +++ b/toolkit/components/resistfingerprinting/RFPHelper.jsm @@ -390,7 +390,9 @@ class _RFPHelper { // ... privileged pages contentPrincipal.isSystemPrincipal || // ... about: URIs EXCEPT about:blank - (currentURI.schemeIs("about") && currentURI.filePath !== "blank") + (currentURI.schemeIs("about") && currentURI.filePath !== "blank") || + // ... browser extensions + contentPrincipal.addonPolicy ); }

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richard pushed a commit to branch tor-browser-91.13.0esr-11.5-1 in repository tor-browser.

commit 672069ae1cc3e7df4124433a0a4ffa0524024dd8 Author: Richard Pospesel richard@torproject.org AuthorDate: Mon Oct 28 17:42:17 2019 -0700

Bug 32220: Improve the letterboxing experience

CSS and JS changes to alter the UX surrounding letterboxing. The browser element containing page content is now anchored to the bottom of the toolbar, and the remaining letterbox margin is the same color as the firefox chrome. The letterbox margin and outline are tied to the currently selected theme.

Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1594455 --- browser/base/content/browser.css | 8 ++++++++ toolkit/components/resistfingerprinting/RFPHelper.jsm | 8 +++++--- 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/browser/base/content/browser.css b/browser/base/content/browser.css index b1aef1309784..384475e92753 100644 --- a/browser/base/content/browser.css +++ b/browser/base/content/browser.css @@ -100,10 +100,18 @@ body { **/ .letterboxing .browserStack > browser:not(.exclude-letterboxing) { margin: 0; /* to be dynamically set by RFHelper.jsm */ + outline: 1px solid var(--chrome-content-separator-color); }

browser.exclude-letterboxing { margin: 0 !important; + outline: initial; +} + +/* extend down the toolbar's colors when letterboxing is enabled */ +.letterboxing { + background-color: var(--toolbar-bgcolor); + background-image: var(--toolbar-bgimage); }

%ifdef MENUBAR_CAN_AUTOHIDE diff --git a/toolkit/components/resistfingerprinting/RFPHelper.jsm b/toolkit/components/resistfingerprinting/RFPHelper.jsm index 7bd645c308d4..388fb372a735 100644 --- a/toolkit/components/resistfingerprinting/RFPHelper.jsm +++ b/toolkit/components/resistfingerprinting/RFPHelper.jsm @@ -524,6 +524,7 @@ class _RFPHelper { // Calculating the margins around the browser element in order to round the // content viewport. We will use a 200x100 stepping if the dimension set // is not given. + // Margin and outline colors are set in browser.css (.letterboxing * selectors).

const buildMarginStyleString = (aWidth, aHeight) => { const marginDims = calcMargins(aWidth, aHeight); @@ -586,9 +587,10 @@ class _RFPHelper { }

log(`${logPrefix} setting margins to ${marginStyleString}`); - // One cannot (easily) control the color of a margin unfortunately. - // An initial attempt to use a border instead of a margin resulted - // in offset event dispatching; so for now we use a colorless margin. + // Here we set the browser's margin to round its content size. + // A "border" visual is created by using a CSS outline, which does't + // affect layout, while the background appearance is borrowed from the + // toolbar and set in the .letterboxing ancestor (see browser.css). marginChanges.perform(); }