commit 3a0ab3671ad4fd730e938ed04ff4d0328ee92369 Author: Kathy Brade brade@pearlcrescent.com Date: Mon Oct 28 15:50:03 2013 -0400

Bug #9570: Private browsing changes since FF ESR 17.

Clear the private browsing image cache as well as the regular one. --- src/chrome/content/torbutton.js | 67 ++++++++++++++++++++++++++++++++------- 1 file changed, 55 insertions(+), 12 deletions(-)

diff --git a/src/chrome/content/torbutton.js b/src/chrome/content/torbutton.js index c97a1bd..f364303 100644 --- a/src/chrome/content/torbutton.js +++ b/src/chrome/content/torbutton.js @@ -1518,18 +1518,7 @@ function torbutton_do_new_identity() { m_tb_prefs.setIntPref("browser.sessionstore.max_tabs_undo", tabs);

torbutton_log(3, "New Identity: Clearing Image Cache"); - - try { - var imgCache = Components.classes["@mozilla.org/image/cache;1"]. - getService(Components.interfaces.imgICache); - imgCache.clearCache(false); // evict all but chrome cache - } catch(e) { - // FIXME: This can happen in some rare cases involving XULish image data - // in combination with our image cache isolation patch. Sure isn't - // a good thing, but it's not really a super-cookie vector either. - // We should fix it eventually. - torbutton_log(4, "Exception on image cache clearing: "+e); - } + torbutton_clear_image_caches();

torbutton_log(3, "New Identity: Clearing Offline Cache");

@@ -1634,6 +1623,60 @@ function torbutton_do_new_identity() { window.close(); }

+function torbutton_clear_image_caches() +{ + try { + let imgCache; + let imgTools = Cc["@mozilla.org/image/tools;1"].getService(Ci.imgITools); + if (!("getImgCacheForDocument" in imgTools)) { + // In Firefox 17 and older, there is one global image cache. Clear it. + imgCache = Cc["@mozilla.org/image/cache;1"].getService(Ci.imgICache); + imgCache.clearCache(false); // evict all but chrome cache + } else { + // In Firefox 18 and newer, there are two image caches: one that is + // used for regular browsing and one that is used for private browsing. + + // Clear the non-private browsing image cache. + imgCache = imgTools.getImgCacheForDocument(null); + imgCache.clearCache(false); // evict all but chrome cache + + // Try to clear the private browsing cache. To do so, we must locate + // a content document that is contained within a private browsing window. + let didClearPBCache = false; + let wm = Cc["@mozilla.org/appshell/window-mediator;1"] + .getService(Ci.nsIWindowMediator); + let enumerator = wm.getEnumerator("navigator:browser"); + while (!didClearPBCache && enumerator.hasMoreElements()) { + let win = enumerator.getNext(); + let browserDoc = win.document.documentElement; + if (!browserDoc.hasAttribute("privatebrowsingmode")) + continue; + + let tabbrowser = win.getBrowser(); + if (!tabbrowser) + continue; + + var tabCount = tabbrowser.browsers.length; + for (var i = 0; i < tabCount; i++) { + let doc = tabbrowser.browsers[i].contentDocument; + if (doc) { + imgCache = imgTools.getImgCacheForDocument(doc); + imgCache.clearCache(false); // evict all but chrome cache + didClearPBCache = true; + break; + } + } + } + } + } catch(e) { + // FIXME: This can happen in some rare cases involving XULish image data + // in combination with our image cache isolation patch. Sure isn't + // a good thing, but it's not really a super-cookie vector either. + // We should fix it eventually. + torbutton_log(4, "Exception on image cache clearing: "+e); + } +} + function torbutton_do_tor_check() { let checkSvc = Cc["@torproject.org/torbutton-torCheckService;1"]