The Tor Browser: browser/base/content/utilityOverlay.js@ca08bd8f51b2

     1 # -*- Mode: javascript; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-

     2 # This Source Code Form is subject to the terms of the Mozilla Public

     3 # License, v. 2.0. If a copy of the MPL was not distributed with this

     4 # file, You can obtain one at http://mozilla.org/MPL/2.0/.

     6 // Services = object with smart getters for common XPCOM services

     7 Components.utils.import("resource://gre/modules/Services.jsm");

     8 Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");

     9 Components.utils.import("resource://gre/modules/PrivateBrowsingUtils.jsm");

    10 Components.utils.import("resource:///modules/RecentWindow.jsm");

    12 XPCOMUtils.defineLazyGetter(this, "BROWSER_NEW_TAB_URL", function () {

    13   const PREF = "browser.newtab.url";

    15   function getNewTabPageURL() {

    16     if (!Services.prefs.prefHasUserValue(PREF)) {

    17       if (PrivateBrowsingUtils.isWindowPrivate(window) &&

    18           !PrivateBrowsingUtils.permanentPrivateBrowsing)

    19         return "about:privatebrowsing";

    20     }

    21     let url = Services.prefs.getComplexValue(PREF, Ci.nsISupportsString).data;

    22     return url || "about:blank";

    23   }

    25   function update() {

    26     BROWSER_NEW_TAB_URL = getNewTabPageURL();

    27   }

    29   Services.prefs.addObserver(PREF, update, false);

    31   addEventListener("unload", function onUnload() {

    32     removeEventListener("unload", onUnload);

    33     Services.prefs.removeObserver(PREF, update);

    34   });

    36   return getNewTabPageURL();

    37 });

    39 var TAB_DROP_TYPE = "application/x-moz-tabbrowser-tab";

    41 var gBidiUI = false;

    43 /**

    44  * Determines whether the given url is considered a special URL for new tabs.

    45  */

    46 function isBlankPageURL(aURL) {

    47   return aURL == "about:blank" || aURL == BROWSER_NEW_TAB_URL;

    48 }

    50 function getBrowserURL()

    51 {

    52   return "chrome://browser/content/browser.xul";

    53 }

    55 function getTopWin(skipPopups) {

    56   // If this is called in a browser window, use that window regardless of

    57   // whether it's the frontmost window, since commands can be executed in

    58   // background windows (bug 626148).

    59   if (top.document.documentElement.getAttribute("windowtype") == "navigator:browser" &&

    60       (!skipPopups || top.toolbar.visible))

    61     return top;

    63   let isPrivate = PrivateBrowsingUtils.isWindowPrivate(window);

    64   return RecentWindow.getMostRecentBrowserWindow({private: isPrivate,

    65                                                   allowPopups: !skipPopups});

    66 }

    68 function openTopWin(url) {

    69   /* deprecated */

    70   openUILinkIn(url, "current");

    71 }

    73 function getBoolPref(prefname, def)

    74 {

    75   try {

    76     return Services.prefs.getBoolPref(prefname);

    77   }

    78   catch(er) {

    79     return def;

    80   }

    81 }

    83 /* openUILink handles clicks on UI elements that cause URLs to load.

    84  *

    85  * As the third argument, you may pass an object with the same properties as

    86  * accepted by openUILinkIn, plus "ignoreButton" and "ignoreAlt".

    87  */

    88 function openUILink(url, event, aIgnoreButton, aIgnoreAlt, aAllowThirdPartyFixup,

    89                     aPostData, aReferrerURI) {

    90   let params;

    92   if (aIgnoreButton && typeof aIgnoreButton == "object") {

    93     params = aIgnoreButton;

    95     // don't forward "ignoreButton" and "ignoreAlt" to openUILinkIn

    96     aIgnoreButton = params.ignoreButton;

    97     aIgnoreAlt = params.ignoreAlt;

    98     delete params.ignoreButton;

    99     delete params.ignoreAlt;

   100   } else {

   101     params = {

   102       allowThirdPartyFixup: aAllowThirdPartyFixup,

   103       postData: aPostData,

   104       referrerURI: aReferrerURI,

   105       initiatingDoc: event ? event.target.ownerDocument : null

   106     };

   107   }

   109   let where = whereToOpenLink(event, aIgnoreButton, aIgnoreAlt);

   110   openUILinkIn(url, where, params);

   111 }

   114 /* whereToOpenLink() looks at an event to decide where to open a link.

   115  *

   116  * The event may be a mouse event (click, double-click, middle-click) or keypress event (enter).

   117  *

   118  * On Windows, the modifiers are:

   119  * Ctrl        new tab, selected

   120  * Shift       new window

   121  * Ctrl+Shift  new tab, in background

   122  * Alt         save

   123  *

   124  * Middle-clicking is the same as Ctrl+clicking (it opens a new tab).

   125  *

   126  * Exceptions:

   127  * - Alt is ignored for menu items selected using the keyboard so you don't accidentally save stuff.

   128  *    (Currently, the Alt isn't sent here at all for menu items, but that will change in bug 126189.)

   129  * - Alt is hard to use in context menus, because pressing Alt closes the menu.

   130  * - Alt can't be used on the bookmarks toolbar because Alt is used for "treat this as something draggable".

   131  * - The button is ignored for the middle-click-paste-URL feature, since it's always a middle-click.

   132  */

   133 function whereToOpenLink( e, ignoreButton, ignoreAlt )

   134 {

   135   // This method must treat a null event like a left click without modifier keys (i.e.

   136   // e = { shiftKey:false, ctrlKey:false, metaKey:false, altKey:false, button:0 })

   137   // for compatibility purposes.

   138   if (!e)

   139     return "current";

   141   var shift = e.shiftKey;

   142   var ctrl =  e.ctrlKey;

   143   var meta =  e.metaKey;

   144   var alt  =  e.altKey && !ignoreAlt;

   146   // ignoreButton allows "middle-click paste" to use function without always opening in a new window.

   147   var middle = !ignoreButton && e.button == 1;

   148   var middleUsesTabs = getBoolPref("browser.tabs.opentabfor.middleclick", true);

   150   // Don't do anything special with right-mouse clicks.  They're probably clicks on context menu items.

   152 #ifdef XP_MACOSX

   153   if (meta || (middle && middleUsesTabs))

   154 #else

   155   if (ctrl || (middle && middleUsesTabs))

   156 #endif

   157     return shift ? "tabshifted" : "tab";

   159   if (alt && getBoolPref("browser.altClickSave", false))

   160     return "save";

   162   if (shift || (middle && !middleUsesTabs))

   163     return "window";

   165   return "current";

   166 }

   168 /* openUILinkIn opens a URL in a place specified by the parameter |where|.

   169  *

   170  * |where| can be:

   171  *  "current"     current tab            (if there aren't any browser windows, then in a new window instead)

   172  *  "tab"         new tab                (if there aren't any browser windows, then in a new window instead)

   173  *  "tabshifted"  same as "tab" but in background if default is to select new tabs, and vice versa

   174  *  "window"      new window

   175  *  "save"        save to disk (with no filename hint!)

   176  *

   177  * aAllowThirdPartyFixup controls whether third party services such as Google's

   178  * I Feel Lucky are allowed to interpret this URL. This parameter may be

   179  * undefined, which is treated as false.

   180  *

   181  * Instead of aAllowThirdPartyFixup, you may also pass an object with any of

   182  * these properties:

   183  *   allowThirdPartyFixup (boolean)

   184  *   postData             (nsIInputStream)

   185  *   referrerURI          (nsIURI)

   186  *   relatedToCurrent     (boolean)

   187  *   skipTabAnimation     (boolean)

   188  */

   189 function openUILinkIn(url, where, aAllowThirdPartyFixup, aPostData, aReferrerURI) {

   190   var params;

   192   if (arguments.length == 3 && typeof arguments[2] == "object") {

   193     params = aAllowThirdPartyFixup;

   194   } else {

   195     params = {

   196       allowThirdPartyFixup: aAllowThirdPartyFixup,

   197       postData: aPostData,

   198       referrerURI: aReferrerURI

   199     };

   200   }

   202   params.fromChrome = true;

   204   openLinkIn(url, where, params);

   205 }

   207 function openLinkIn(url, where, params) {

   208   if (!where || !url)

   209     return;

   211   var aFromChrome           = params.fromChrome;

   212   var aAllowThirdPartyFixup = params.allowThirdPartyFixup;

   213   var aPostData             = params.postData;

   214   var aCharset              = params.charset;

   215   var aReferrerURI          = params.referrerURI;

   216   var aRelatedToCurrent     = params.relatedToCurrent;

   217   var aDisableMCB           = params.disableMCB;

   218   var aInBackground         = params.inBackground;

   219   var aDisallowInheritPrincipal = params.disallowInheritPrincipal;

   220   var aInitiatingDoc        = params.initiatingDoc;

   221   var aIsPrivate            = params.private;

   222   var aSkipTabAnimation     = params.skipTabAnimation;

   224   if (where == "save") {

   225     if (!aInitiatingDoc) {

   226       Components.utils.reportError("openUILink/openLinkIn was called with " +

   227         "where == 'save' but without initiatingDoc.  See bug 814264.");

   228       return;

   229     }

   230     saveURL(url, null, null, true, null, aReferrerURI, aInitiatingDoc);

   231     return;

   232   }

   233   const Cc = Components.classes;

   234   const Ci = Components.interfaces;

   236   var w = getTopWin();

   237   if ((where == "tab" || where == "tabshifted") &&

   238       w && !w.toolbar.visible) {

   239     w = getTopWin(true);

   240     aRelatedToCurrent = false;

   241   }

   243   if (!w || where == "window") {

   244     var sa = Cc["@mozilla.org/supports-array;1"].

   245              createInstance(Ci.nsISupportsArray);

   247     var wuri = Cc["@mozilla.org/supports-string;1"].

   248                createInstance(Ci.nsISupportsString);

   249     wuri.data = url;

   251     let charset = null;

   252     if (aCharset) {

   253       charset = Cc["@mozilla.org/supports-string;1"]

   254                   .createInstance(Ci.nsISupportsString);

   255       charset.data = "charset=" + aCharset;

   256     }

   258     var allowThirdPartyFixupSupports = Cc["@mozilla.org/supports-PRBool;1"].

   259                                        createInstance(Ci.nsISupportsPRBool);

   260     allowThirdPartyFixupSupports.data = aAllowThirdPartyFixup;

   262     sa.AppendElement(wuri);

   263     sa.AppendElement(charset);

   264     sa.AppendElement(aReferrerURI);

   265     sa.AppendElement(aPostData);

   266     sa.AppendElement(allowThirdPartyFixupSupports);

   268     let features = "chrome,dialog=no,all";

   269     if (aIsPrivate) {

   270       features += ",private";

   271     }

   273     Services.ww.openWindow(w || window, getBrowserURL(), null, features, sa);

   274     return;

   275   }

   277   let loadInBackground = where == "current" ? false : aInBackground;

   278   if (loadInBackground == null) {

   279     loadInBackground = aFromChrome ?

   280                          false :

   281                          getBoolPref("browser.tabs.loadInBackground");

   282   }

   284   if (where == "current" && w.gBrowser.selectedTab.pinned) {

   285     try {

   286       let uriObj = Services.io.newURI(url, null, null);

   287       if (!uriObj.schemeIs("javascript") &&

   288           w.gBrowser.currentURI.host != uriObj.host) {

   289         where = "tab";

   290         loadInBackground = false;

   291       }

   292     } catch (err) {

   293       where = "tab";

   294       loadInBackground = false;

   295     }

   296   }

   298   // Raise the target window before loading the URI, since loading it may

   299   // result in a new frontmost window (e.g. "javascript:window.open('');").

   300   w.focus();

   302   switch (where) {

   303   case "current":

   304     let flags = Ci.nsIWebNavigation.LOAD_FLAGS_NONE;

   305     if (aAllowThirdPartyFixup) {

   306       flags |= Ci.nsIWebNavigation.LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP;

   307       flags |= Ci.nsIWebNavigation.LOAD_FLAGS_FIXUP_SCHEME_TYPOS;

   308     }

   309     if (aDisallowInheritPrincipal)

   310       flags |= Ci.nsIWebNavigation.LOAD_FLAGS_DISALLOW_INHERIT_OWNER;

   311     w.gBrowser.loadURIWithFlags(url, flags, aReferrerURI, null, aPostData);

   312     break;

   313   case "tabshifted":

   314     loadInBackground = !loadInBackground;

   315     // fall through

   316   case "tab":

   317     let browser = w.gBrowser;

   318     browser.loadOneTab(url, {

   319                        referrerURI: aReferrerURI,

   320                        charset: aCharset,

   321                        postData: aPostData,

   322                        inBackground: loadInBackground,

   323                        allowThirdPartyFixup: aAllowThirdPartyFixup,

   324                        relatedToCurrent: aRelatedToCurrent,

   325                        skipAnimation: aSkipTabAnimation,

   326                        disableMCB: aDisableMCB});

   327     break;

   328   }

   330   w.gBrowser.selectedBrowser.focus();

   332   if (!loadInBackground && w.isBlankPageURL(url))

   333     w.focusAndSelectUrlBar();

   334 }

   336 // Used as an onclick handler for UI elements with link-like behavior.

   337 // e.g. onclick="checkForMiddleClick(this, event);"

   338 function checkForMiddleClick(node, event) {

   339   // We should be using the disabled property here instead of the attribute,

   340   // but some elements that this function is used with don't support it (e.g.

   341   // menuitem).

   342   if (node.getAttribute("disabled") == "true")

   343     return; // Do nothing

   345   if (event.button == 1) {

   346     /* Execute the node's oncommand or command.

   347      *

   348      * XXX: we should use node.oncommand(event) once bug 246720 is fixed.

   349      */

   350     var target = node.hasAttribute("oncommand") ? node :

   351                  node.ownerDocument.getElementById(node.getAttribute("command"));

   352     var fn = new Function("event", target.getAttribute("oncommand"));

   353     fn.call(target, event);

   355     // If the middle-click was on part of a menu, close the menu.

   356     // (Menus close automatically with left-click but not with middle-click.)

   357     closeMenus(event.target);

   358   }

   359 }

   361 // Closes all popups that are ancestors of the node.

   362 function closeMenus(node)

   363 {

   364   if ("tagName" in node) {

   365     if (node.namespaceURI == "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"

   366     && (node.tagName == "menupopup" || node.tagName == "popup"))

   367       node.hidePopup();

   369     closeMenus(node.parentNode);

   370   }

   371 }

   373 // Gather all descendent text under given document node.

   374 function gatherTextUnder ( root )

   375 {

   376   var text = "";

   377   var node = root.firstChild;

   378   var depth = 1;

   379   while ( node && depth > 0 ) {

   380     // See if this node is text.

   381     if ( node.nodeType == Node.TEXT_NODE ) {

   382       // Add this text to our collection.

   383       text += " " + node.data;

   384     } else if ( node instanceof HTMLImageElement) {

   385       // If it has an "alt" attribute, add that.

   386       var altText = node.getAttribute( "alt" );

   387       if ( altText && altText != "" ) {

   388         text += " " + altText;

   389       }

   390     }

   391     // Find next node to test.

   392     // First, see if this node has children.

   393     if ( node.hasChildNodes() ) {

   394       // Go to first child.

   395       node = node.firstChild;

   396       depth++;

   397     } else {

   398       // No children, try next sibling (or parent next sibling).

   399       while ( depth > 0 && !node.nextSibling ) {

   400         node = node.parentNode;

   401         depth--;

   402       }

   403       if ( node.nextSibling ) {

   404         node = node.nextSibling;

   405       }

   406     }

   407   }

   408   // Strip leading and tailing whitespace.

   409   text = text.trim();

   410   // Compress remaining whitespace.

   411   text = text.replace( /\s+/g, " " );

   412   return text;

   413 }

   415 function getShellService()

   416 {

   417   var shell = null;

   418   try {

   419     shell = Components.classes["@mozilla.org/browser/shell-service;1"]

   420       .getService(Components.interfaces.nsIShellService);

   421   } catch (e) {

   422   }

   423   return shell;

   424 }

   426 function isBidiEnabled() {

   427   // first check the pref.

   428   if (getBoolPref("bidi.browser.ui", false))

   429     return true;

   431   // then check intl.uidirection.<locale>

   432   var chromeReg = Components.classes["@mozilla.org/chrome/chrome-registry;1"].

   433                   getService(Components.interfaces.nsIXULChromeRegistry);

   434   if (chromeReg.isLocaleRTL("global"))

   435     return true;

   437   // now see if the system locale is an RTL one.

   438   var rv = false;

   440   try {

   441     var localeService = Components.classes["@mozilla.org/intl/nslocaleservice;1"]

   442                                   .getService(Components.interfaces.nsILocaleService);

   443     var systemLocale = localeService.getSystemLocale().getCategory("NSILOCALE_CTYPE").substr(0,3);

   445     switch (systemLocale) {

   446       case "ar-":

   447       case "he-":

   448       case "fa-":

   449       case "ug-":

   450       case "ur-":

   451       case "syr":

   452         rv = true;

   453         Services.prefs.setBoolPref("bidi.browser.ui", true);

   454     }

   455   } catch (e) {}

   457   return rv;

   458 }

   460 function openAboutDialog() {

   461   var enumerator = Services.wm.getEnumerator("Browser:About");

   462   while (enumerator.hasMoreElements()) {

   463     // Only open one about window (Bug 599573)

   464     let win = enumerator.getNext();

   465     if (win.closed) {

   466       continue;

   467     }

   468     win.focus();

   469     return;

   470   }

   472 #ifdef XP_WIN

   473   var features = "chrome,centerscreen,dependent";

   474 #elifdef XP_MACOSX

   475   var features = "chrome,resizable=no,minimizable=no";

   476 #else

   477   var features = "chrome,centerscreen,dependent,dialog=no";

   478 #endif

   479   window.openDialog("chrome://browser/content/aboutDialog.xul", "", features);

   480 }

   482 function openPreferences(paneID, extraArgs)

   483 {

   484   function switchToAdvancedSubPane(doc) {

   485     if (extraArgs && extraArgs["advancedTab"]) {

   486       let advancedPaneTabs = doc.getElementById("advancedPrefs");

   487       advancedPaneTabs.selectedTab = doc.getElementById(extraArgs["advancedTab"]);

   488     }

   489   }

   491   if (getBoolPref("browser.preferences.inContent")) {

   492     let win = Services.wm.getMostRecentWindow("navigator:browser");

   493     if (!win) {

   494       return;

   495     }

   497     let newLoad = !win.switchToTabHavingURI("about:preferences", true);

   498     let browser = win.gBrowser.selectedBrowser;

   500     function switchToPane() {

   501       if (paneID) {

   502         browser.contentWindow.selectCategory(paneID);

   503       }

   504       switchToAdvancedSubPane(browser.contentDocument);

   505     }

   507     if (newLoad) {

   508       browser.addEventListener("load", function onload() {

   509         browser.removeEventListener("load", onload, true);

   510         switchToPane();

   511       }, true);

   512     } else {

   513       switchToPane();

   514     }

   515   } else {

   516     var instantApply = getBoolPref("browser.preferences.instantApply", false);

   517     var features = "chrome,titlebar,toolbar,centerscreen" + (instantApply ? ",dialog=no" : ",modal");

   519     var win = Services.wm.getMostRecentWindow("Browser:Preferences");

   520     if (win) {

   521       win.focus();

   522       if (paneID) {

   523         var pane = win.document.getElementById(paneID);

   524         win.document.documentElement.showPane(pane);

   525       }

   527       switchToAdvancedSubPane(win.document);

   528     } else {

   529       openDialog("chrome://browser/content/preferences/preferences.xul",

   530                  "Preferences", features, paneID, extraArgs);

   531     }

   532   }

   533 }

   535 function openAdvancedPreferences(tabID)

   536 {

   537   openPreferences("paneAdvanced", { "advancedTab" : tabID });

   538 }

   540 /**

   541  * Opens the troubleshooting information (about:support) page for this version

   542  * of the application.

   543  */

   544 function openTroubleshootingPage()

   545 {

   546   openUILinkIn("about:support", "tab");

   547 }

   549 #ifdef MOZ_SERVICES_HEALTHREPORT

   550 /**

   551  * Opens the troubleshooting information (about:support) page for this version

   552  * of the application.

   553  */

   554 function openHealthReport()

   555 {

   556   openUILinkIn("about:healthreport", "tab");

   557 }

   558 #endif

   560 /**

   561  * Opens the feedback page for this version of the application.

   562  */

   563 function openFeedbackPage()

   564 {

   565   var url = Components.classes["@mozilla.org/toolkit/URLFormatterService;1"]

   566                       .getService(Components.interfaces.nsIURLFormatter)

   567                       .formatURLPref("app.feedback.baseURL");

   568   openUILinkIn(url, "tab");

   569 }

   571 function openTourPage()

   572 {

   573   let scope = {}

   574   Components.utils.import("resource:///modules/UITour.jsm", scope);

   575   openUILinkIn(scope.UITour.url, "tab");

   576 }

   578 function buildHelpMenu()

   579 {

   580   // Enable/disable the "Report Web Forgery" menu item.

   581   if (typeof gSafeBrowsing != "undefined")

   582     gSafeBrowsing.setReportPhishingMenu();

   583 }

   585 function isElementVisible(aElement)

   586 {

   587   if (!aElement)

   588     return false;

   590   // If aElement or a direct or indirect parent is hidden or collapsed,

   591   // height, width or both will be 0.

   592   var bo = aElement.boxObject;

   593   return (bo.height > 0 && bo.width > 0);

   594 }

   596 function makeURLAbsolute(aBase, aUrl)

   597 {

   598   // Note:  makeURI() will throw if aUri is not a valid URI

   599   return makeURI(aUrl, null, makeURI(aBase)).spec;

   600 }

   602 /**

   603  * openNewTabWith: opens a new tab with the given URL.

   604  *

   605  * @param aURL

   606  *        The URL to open (as a string).

   607  * @param aDocument

   608  *        Note this parameter is now ignored. There is no security check & no

   609  *        referrer header derived from aDocument (null case).

   610  * @param aPostData

   611  *        Form POST data, or null.

   612  * @param aEvent

   613  *        The triggering event (for the purpose of determining whether to open

   614  *        in the background), or null.

   615  * @param aAllowThirdPartyFixup

   616  *        If true, then we allow the URL text to be sent to third party services

   617  *        (e.g., Google's I Feel Lucky) for interpretation. This parameter may

   618  *        be undefined in which case it is treated as false.

   619  * @param [optional] aReferrer

   620  *        This will be used as the referrer. There will be no security check.

   621  */

   622 function openNewTabWith(aURL, aDocument, aPostData, aEvent,

   623                         aAllowThirdPartyFixup, aReferrer) {

   625   // As in openNewWindowWith(), we want to pass the charset of the

   626   // current document over to a new tab.

   627   let originCharset = null;

   628   if (document.documentElement.getAttribute("windowtype") == "navigator:browser")

   629     originCharset = gBrowser.selectedBrowser.characterSet;

   631   openLinkIn(aURL, aEvent && aEvent.shiftKey ? "tabshifted" : "tab",

   632              { charset: originCharset,

   633                postData: aPostData,

   634                allowThirdPartyFixup: aAllowThirdPartyFixup,

   635                referrerURI: aReferrer });

   636 }

   638 /**

   639  * @param aDocument

   640  *        Note this parameter is ignored. See openNewTabWith()

   641  */

   642 function openNewWindowWith(aURL, aDocument, aPostData, aAllowThirdPartyFixup, aReferrer) {

   643   // Extract the current charset menu setting from the current document and

   644   // use it to initialize the new browser window...

   645   let originCharset = null;

   646   if (document.documentElement.getAttribute("windowtype") == "navigator:browser")

   647     originCharset = gBrowser.selectedBrowser.characterSet;

   649   openLinkIn(aURL, "window",

   650              { charset: originCharset,

   651                postData: aPostData,

   652                allowThirdPartyFixup: aAllowThirdPartyFixup,

   653                referrerURI: aReferrer });

   654 }

   656 // aCalledFromModal is optional

   657 function openHelpLink(aHelpTopic, aCalledFromModal, aWhere) {

   658   var url = Components.classes["@mozilla.org/toolkit/URLFormatterService;1"]

   659                       .getService(Components.interfaces.nsIURLFormatter)

   660                       .formatURLPref("app.support.baseURL");

   661   url += aHelpTopic;

   663   var where = aWhere;

   664   if (!aWhere)

   665     where = aCalledFromModal ? "window" : "tab";

   667   openUILinkIn(url, where);

   668 }

   670 function openPrefsHelp() {

   671   // non-instant apply prefwindows are usually modal, so we can't open in the topmost window,

   672   // since its probably behind the window.

   673   var instantApply = getBoolPref("browser.preferences.instantApply");

   675   var helpTopic = document.getElementsByTagName("prefwindow")[0].currentPane.helpTopic;

   676   openHelpLink(helpTopic, !instantApply);

   677 }

   679 function trimURL(aURL) {

   680   // This function must not modify the given URL such that calling

   681   // nsIURIFixup::createFixupURI with the result will produce a different URI.

   682   return aURL /* remove single trailing slash for http/https/ftp URLs */

   683              .replace(/^((?:http|https|ftp):\/\/[^/]+)\/$/, "$1")

   684               /* remove http:// unless the host starts with "ftp\d*\." or contains "@" */

   685              .replace(/^http:\/\/((?!ftp\d*\.)[^\/@]+(?:\/|$))/, "$1");

   686 }

The Tor Browser / file revision

browser/base/content/utilityOverlay.js@ca08bd8f51b2

browser/base/content/utilityOverlay.js