Issue #756 - Remove Contextual Identity from Basilisk

9 files changed, 24 insertions, 469 deletions

diff --git a/application/basilisk/base/content/browser-context.inc b/application/basilisk/base/content/browser-context.inc
index 36e0478af..2f6b19da0 100644
--- a/application/basilisk/base/content/browser-context.inc
+++ b/application/basilisk/base/content/browser-context.inc
@@ -51,23 +51,11 @@
                 label="&openLinkCmdInCurrent.label;"
                 accesskey="&openLinkCmdInCurrent.accesskey;"
                 oncommand="gContextMenu.openLinkInCurrent();"/>
-# label and data-usercontextid are dynamically set.
-      <menuitem id="context-openlinkincontainertab"
-                accesskey="&openLinkCmdInTab.accesskey;"
-                oncommand="gContextMenu.openLinkInTab(event);"/>
+# label is dynamically set.
       <menuitem id="context-openlinkintab"
                 label="&openLinkCmdInTab.label;"
                 accesskey="&openLinkCmdInTab.accesskey;"
-                data-usercontextid="0"
-                oncommand="gContextMenu.openLinkInTab(event);"/>
-
-      <menu id="context-openlinkinusercontext-menu"
-            label="&openLinkCmdInContainerTab.label;"
-            accesskey="&openLinkCmdInContainerTab.accesskey;"
-            hidden="true">
-        <menupopup oncommand="gContextMenu.openLinkInTab(event);"
-                   onpopupshowing="return gContextMenu.createContainerMenu(event);" />
-      </menu>
+                oncommand="gContextMenu.openLinkInTab();"/>
 
       <menuitem id="context-openlink"
                 label="&openLinkCmd.label;"
diff --git a/application/basilisk/base/content/browser-menubar.inc b/application/basilisk/base/content/browser-menubar.inc
index 41734711c..0549ad915 100644
--- a/application/basilisk/base/content/browser-menubar.inc
+++ b/application/basilisk/base/content/browser-menubar.inc
@@ -11,19 +11,12 @@
                 style="border:0px;padding:0px;margin:0px;-moz-appearance:none">
             <menu id="file-menu" label="&fileMenu.label;"
                   accesskey="&fileMenu.accesskey;">
-              <menupopup id="menu_FilePopup"
-                         onpopupshowing="updateUserContextUIVisibility();">
+              <menupopup id="menu_FilePopup">
                 <menuitem id="menu_newNavigatorTab"
                           label="&tabCmd.label;"
                           command="cmd_newNavigatorTab"
                           key="key_newNavigatorTab"
                           accesskey="&tabCmd.accesskey;"/>
-                <menu id="menu_newUserContext"
-                      label="&newUserContext.label;"
-                      accesskey="&newUserContext.accesskey;"
-                      hidden="true">
-                  <menupopup onpopupshowing="return createUserContextMenu(event);" />
-                </menu>
                 <menuitem id="menu_newNavigator"
                           label="&newNavigatorCmd.label;"
                           accesskey="&newNavigatorCmd.accesskey;"
diff --git a/application/basilisk/base/content/browser.js b/application/basilisk/base/content/browser.js
index 336670fa0..aa8a8413e 100644
--- a/application/basilisk/base/content/browser.js
+++ b/application/basilisk/base/content/browser.js
@@ -8,7 +8,6 @@ var Cu = Components.utils;
 var Cc = Components.classes;
 
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
-Cu.import("resource://gre/modules/ContextualIdentityService.jsm");
 Cu.import("resource://gre/modules/NotificationDB.jsm");
 
 // lazy module getters
@@ -827,10 +826,6 @@ function _loadURIWithFlags(browser, uri, params) {
   }
   try {
     if (!mustChangeProcess) {
-      if (params.userContextId) {
-        browser.webNavigation.setOriginAttributesBeforeLoading({ userContextId: params.userContextId });
-      }
-
       browser.webNavigation.loadURIWithOptions(uri, flags,
                                                referrer, referrerPolicy,
                                                postData, null, null, triggeringPrincipal);
@@ -856,10 +851,6 @@ function _loadURIWithFlags(browser, uri, params) {
         postData: postData
       }
 
-      if (params.userContextId) {
-        loadParams.userContextId = params.userContextId;
-      }
-
       LoadInOtherProcess(browser, loadParams);
     }
   } catch (e) {
@@ -872,10 +863,6 @@ function _loadURIWithFlags(browser, uri, params) {
       Cu.reportError(e);
       gBrowser.updateBrowserRemotenessByURL(browser, uri);
 
-      if (params.userContextId) {
-        browser.webNavigation.setOriginAttributesBeforeLoading({ userContextId: params.userContextId });
-      }
-
       browser.webNavigation.loadURIWithOptions(uri, flags, referrer, referrerPolicy,
                                                postData, null, null, triggeringPrincipal);
     } else {
@@ -939,16 +926,6 @@ addEventListener("DOMContentLoaded", function onDCL() {
   let initBrowser =
     document.getAnonymousElementByAttribute(gBrowser, "anonid", "initialBrowser");
 
-  // The window's first argument is a tab if and only if we are swapping tabs.
-  // We must set the browser's usercontextid before updateBrowserRemoteness(),
-  // so that the newly created remote tab child has the correct usercontextid.
-  if (window.arguments) {
-    let tabToOpen = window.arguments[0];
-    if (tabToOpen instanceof XULElement && tabToOpen.hasAttribute("usercontextid")) {
-      initBrowser.setAttribute("usercontextid", tabToOpen.getAttribute("usercontextid"));
-    }
-  }
-
   gBrowser.updateBrowserRemoteness(initBrowser, gMultiProcessBrowser);
 });
 
@@ -1133,13 +1110,6 @@ var gBrowserInit = {
         // make sure it has a docshell
         gBrowser.docShell;
 
-        // We must set usercontextid before updateBrowserRemoteness()
-        // so that the newly created remote tab child has correct usercontextid
-        if (tabToOpen.hasAttribute("usercontextid")) {
-          let usercontextid = tabToOpen.getAttribute("usercontextid");
-          gBrowser.selectedBrowser.setAttribute("usercontextid", usercontextid);
-        }
-
         // If the browser that we're swapping in was remote, then we'd better
         // be able to support remote browsers, and then make our selectedTab
         // remote.
@@ -1165,9 +1135,8 @@ var gBrowserInit = {
       //                 [3]: postData (nsIInputStream)
       //                 [4]: allowThirdPartyFixup (bool)
       //                 [5]: referrerPolicy (int)
-      //                 [6]: userContextId (int)
-      //                 [7]: originPrincipal (nsIPrincipal)
-      //                 [8]: triggeringPrincipal (nsIPrincipal)
+      //                 [6]: originPrincipal (nsIPrincipal)
+      //                 [7]: triggeringPrincipal (nsIPrincipal)
       else if (window.arguments.length >= 3) {
         let referrerURI = window.arguments[2];
         if (typeof(referrerURI) == "string") {
@@ -1179,13 +1148,11 @@ var gBrowserInit = {
         }
         let referrerPolicy = (window.arguments[5] != undefined ?
             window.arguments[5] : Ci.nsIHttpChannel.REFERRER_POLICY_DEFAULT);
-        let userContextId = (window.arguments[6] != undefined ?
-            window.arguments[6] : Ci.nsIScriptSecurityManager.DEFAULT_USER_CONTEXT_ID);
         loadURI(uriToLoad, referrerURI, window.arguments[3] || null,
-                window.arguments[4] || false, referrerPolicy, userContextId,
+                window.arguments[4] || false, referrerPolicy,
                 // pass the origin principal (if any) and force its use to create
                 // an initial about:blank viewer if present:
-                window.arguments[7], !!window.arguments[7], window.arguments[8]);
+                window.arguments[6], !!window.arguments[6], window.arguments[7]);
         window.focus();
       }
       // Note: loadOneOrMoreURIs *must not* be called if window.arguments.length >= 3.
@@ -2070,7 +2037,7 @@ function BrowserTryToCloseWindow()
 }
 
 function loadURI(uri, referrer, postData, allowThirdPartyFixup, referrerPolicy,
-                 userContextId, originPrincipal, forceAboutBlankViewerInCurrent,
+                 originPrincipal, forceAboutBlankViewerInCurrent,
                  triggeringPrincipal) {
   try {
     openLinkIn(uri, "current",
@@ -2078,7 +2045,6 @@ function loadURI(uri, referrer, postData, allowThirdPartyFixup, referrerPolicy,
                  referrerPolicy: referrerPolicy,
                  postData: postData,
                  allowThirdPartyFixup: allowThirdPartyFixup,
-                 userContextId: userContextId,
                  originPrincipal,
                  triggeringPrincipal,
                  forceAboutBlankViewerInCurrent,
@@ -3951,66 +3917,6 @@ function updateEditUIVisibility()
 }
 
 /**
- * Opens a new tab with the userContextId specified as an attribute of
- * sourceEvent. This attribute is propagated to the top level originAttributes
- * living on the tab's docShell.
- *
- * @param event
- *        A click event on a userContext File Menu option
- */
-function openNewUserContextTab(event)
-{
-  openUILinkIn(BROWSER_NEW_TAB_URL, "tab", {
-    userContextId: parseInt(event.target.getAttribute('data-usercontextid')),
-  });
-}
-
-/**
- * Updates File Menu User Context UI visibility depending on
- * privacy.userContext.enabled pref state.
- */
-function updateUserContextUIVisibility()
-{
-  let menu = document.getElementById("menu_newUserContext");
-  menu.hidden = !Services.prefs.getBoolPref("privacy.userContext.enabled");
-  if (PrivateBrowsingUtils.isWindowPrivate(window)) {
-    menu.setAttribute("disabled", "true");
-  }
-}
-
-/**
- * Updates the User Context UI indicators if the browser is in a non-default context
- */
-function updateUserContextUIIndicator()
-{
-  let hbox = document.getElementById("userContext-icons");
-
-  let userContextId = gBrowser.selectedBrowser.getAttribute("usercontextid");
-  if (!userContextId) {
-    hbox.setAttribute("data-identity-color", "");
-    hbox.hidden = true;
-    return;
-  }
-
-  let identity = ContextualIdentityService.getIdentityFromId(userContextId);
-  if (!identity) {
-    hbox.setAttribute("data-identity-color", "");
-    hbox.hidden = true;
-    return;
-  }
-
-  hbox.setAttribute("data-identity-color", identity.color);
-
-  let label = document.getElementById("userContext-label");
-  label.setAttribute("value", ContextualIdentityService.getUserContextLabel(userContextId));
-
-  let indicator = document.getElementById("userContext-indicator");
-  indicator.setAttribute("data-identity-icon", identity.icon);
-
-  hbox.hidden = false;
-}
-
-/**
  * Makes the Character Encoding menu enabled or disabled as appropriate.
  * To be called when the View menu or the app menu is opened.
  */
@@ -4690,7 +4596,6 @@ nsBrowserAccess.prototype = {
 
   _openURIInNewTab: function(aURI, aReferrer, aReferrerPolicy, aIsPrivate,
                              aIsExternal, aForceNotRemote=false,
-                             aUserContextId=Ci.nsIScriptSecurityManager.DEFAULT_USER_CONTEXT_ID,
                              aOpener = null, aTriggeringPrincipal = null) {
     let win, needToFocusWin;
 
@@ -4719,7 +4624,6 @@ nsBrowserAccess.prototype = {
                                       triggeringPrincipal: aTriggeringPrincipal,
                                       referrerURI: aReferrer,
                                       referrerPolicy: aReferrerPolicy,
-                                      userContextId: aUserContextId,
                                       fromExternal: aIsExternal,
                                       inBackground: loadInBackground,
                                       forceNotRemote: aForceNotRemote,
@@ -4796,13 +4700,10 @@ nsBrowserAccess.prototype = {
         // will do the job of shuttling off the newly opened browser to run in
         // the right process once it starts loading a URI.
         let forceNotRemote = !!aOpener;
-        let userContextId = aOpener && aOpener.document
-                              ? aOpener.document.nodePrincipal.originAttributes.userContextId
-                              : Ci.nsIScriptSecurityManager.DEFAULT_USER_CONTEXT_ID;
         let openerWindow = (aFlags & Ci.nsIBrowserDOMWindow.OPEN_NO_OPENER) ? null : aOpener;
         let browser = this._openURIInNewTab(aURI, referrer, referrerPolicy,
                                             isPrivate, isExternal,
-                                            forceNotRemote, userContextId,
+                                            forceNotRemote,
                                             openerWindow, triggeringPrincipal);
         if (browser)
           newWindow = browser.contentWindow;
@@ -4834,16 +4735,10 @@ nsBrowserAccess.prototype = {
 
     var isExternal = !!(aFlags & Ci.nsIBrowserDOMWindow.OPEN_EXTERNAL);
 
-    var userContextId = aParams.openerOriginAttributes &&
-                        ("userContextId" in aParams.openerOriginAttributes)
-                          ? aParams.openerOriginAttributes.userContextId
-                          : Ci.nsIScriptSecurityManager.DEFAULT_USER_CONTEXT_ID
-
     let browser = this._openURIInNewTab(aURI, aParams.referrer,
                                         aParams.referrerPolicy,
                                         aParams.isPrivate,
                                         isExternal, false,
-                                        userContextId, null,
                                         aParams.triggeringPrincipal);
     if (browser)
       return browser.QueryInterface(Ci.nsIFrameLoaderOwner);
@@ -5400,11 +5295,6 @@ function handleLinkClick(event, href, linkNode) {
     triggeringPrincipal: doc.nodePrincipal,
   };
 
-  // The new tab/window must use the same userContextId
-  if (doc.nodePrincipal.originAttributes.userContextId) {
-    params.userContextId = doc.nodePrincipal.originAttributes.userContextId;
-  }
-
   openLinkIn(href, where, params);
   event.preventDefault();
   return true;
@@ -5476,8 +5366,6 @@ function handleDroppedLink(event, urlOrLinks, name)
 
   let lastLocationChange = gBrowser.selectedBrowser.lastLocationChange;
 
-  let userContextId = gBrowser.selectedBrowser.getAttribute("usercontextid");
-
   // event is null if links are dropped in content process.
   // inBackground should be false, as it's loading into current browser.
   let inBackground = false;
@@ -5501,7 +5389,6 @@ function handleDroppedLink(event, urlOrLinks, name)
         replace: true,
         allowThirdPartyFixup: false,
         postDatas,
-        userContextId,
       });
     }
   });
diff --git a/application/basilisk/base/content/browser.xul b/application/basilisk/base/content/browser.xul
index be64f1bac..0cc4c982a 100644
--- a/application/basilisk/base/content/browser.xul
+++ b/application/basilisk/base/content/browser.xul
@@ -8,7 +8,6 @@
 
 <?xml-stylesheet href="chrome://browser/content/browser.css" type="text/css"?>
 <?xml-stylesheet href="chrome://browser/content/places/places.css" type="text/css"?>
-<?xml-stylesheet href="chrome://browser/content/usercontext/usercontext.css" type="text/css"?>
 #ifdef MOZ_DEVTOOLS
 <?xml-stylesheet href="chrome://devtools/skin/devtools-browser.css" type="text/css"?>
 #endif
@@ -551,12 +550,7 @@
                     key="key_undoCloseTab"
                     label="&undoCloseTab.label;"
                     observes="History:UndoCloseTab"/>
-          <menuseparator id="alltabs-popup-separator-1"/>
-          <menu id="alltabs_containersTab"
-                label="&newUserContext.label;">
-            <menupopup id="alltabs_containersMenuTab" />
-          </menu>
-          <menuseparator id="alltabs-popup-separator-2"/>
+          <menuseparator id="alltabs-popup-separator"/>
         </menupopup>
       </toolbarbutton>
 
diff --git a/application/basilisk/base/content/content.js b/application/basilisk/base/content/content.js
index 5accbdf7b..d2a70ba11 100644
--- a/application/basilisk/base/content/content.js
+++ b/application/basilisk/base/content/content.js
@@ -162,9 +162,6 @@ var handleContentContextMenu = function (event) {
 
   let selectionInfo = BrowserUtils.getSelectionDetails(content);
 
-  let loadContext = docShell.QueryInterface(Ci.nsILoadContext);
-  let userContextId = loadContext.originAttributes.userContextId;
-
   if (Services.appinfo.processType == Services.appinfo.PROCESS_TYPE_CONTENT) {
     let editFlags = SpellCheckHelper.isEditable(event.target, content);
     let spellInfo;
@@ -188,7 +185,7 @@ var handleContentContextMenu = function (event) {
                      principal, docLocation, charSet, baseURI, referrer,
                      referrerPolicy, contentType, contentDisposition,
                      frameOuterWindowID, selectionInfo, disableSetDesktopBg,
-                     loginFillInfo, parentAllowsMixedContent, userContextId },
+                     loginFillInfo, parentAllowsMixedContent },
                    { event, popupNode: event.target });
   }
   else {
@@ -212,7 +209,6 @@ var handleContentContextMenu = function (event) {
       disableSetDesktopBackground: disableSetDesktopBg,
       loginFillInfo,
       parentAllowsMixedContent,
-      userContextId,
     };
   }
 }
diff --git a/application/basilisk/base/content/nsContextMenu.js b/application/basilisk/base/content/nsContextMenu.js
index 3f77dcb90..74a2e7a8e 100644
--- a/application/basilisk/base/content/nsContextMenu.js
+++ b/application/basilisk/base/content/nsContextMenu.js
@@ -4,7 +4,6 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-Components.utils.import("resource://gre/modules/ContextualIdentityService.jsm");
 Components.utils.import("resource://gre/modules/PrivateBrowsingUtils.jsm");
 Components.utils.import("resource://gre/modules/InlineSpellChecker.jsm");
 Components.utils.import("resource://gre/modules/LoginManagerContextMenu.jsm");
@@ -142,28 +141,11 @@ nsContextMenu.prototype = {
       this.onPlainTextLink = true;
     }
 
-    var inContainer = false;
-    if (gContextMenuContentData.userContextId) {
-      inContainer = true;
-      var item = document.getElementById("context-openlinkincontainertab");
-
-      item.setAttribute("data-usercontextid", gContextMenuContentData.userContextId);
-
-      var label =
-        ContextualIdentityService.getUserContextLabel(gContextMenuContentData.userContextId);
-      item.setAttribute("label",
-         gBrowserBundle.formatStringFromName("userContextOpenLink.label",
-                                             [label], 1));
-    }
-
     var shouldShow = this.onSaveableLink || isMailtoInternal || this.onPlainTextLink;
     var isWindowPrivate = PrivateBrowsingUtils.isWindowPrivate(window);
-    var showContainers = Services.prefs.getBoolPref("privacy.userContext.enabled");
     this.showItem("context-openlink", shouldShow && !isWindowPrivate);
     this.showItem("context-openlinkprivate", shouldShow);
-    this.showItem("context-openlinkintab", shouldShow && !inContainer);
-    this.showItem("context-openlinkincontainertab", shouldShow && inContainer);
-    this.showItem("context-openlinkinusercontext-menu", shouldShow && !isWindowPrivate && showContainers);
+    this.showItem("context-openlinkintab", shouldShow);
     this.showItem("context-openlinkincurrent", this.onPlainTextLink);
     this.showItem("context-sep-open", shouldShow);
   },
@@ -958,13 +940,6 @@ nsContextMenu.prototype = {
       params[p] = extra[p];
     }
 
-    // If we want to change userContextId, we must be sure that we don't
-    // propagate the referrer.
-    if ("userContextId" in params &&
-        params.userContextId != gContextMenuContentData.userContextId) {
-      params.noReferrer = true;
-    }
-
     return params;
   },
 
@@ -982,7 +957,7 @@ nsContextMenu.prototype = {
   },
 
   // Open linked-to URL in a new tab.
-  openLinkInTab: function(event) {
+  openLinkInTab: function() {
     urlSecurityCheck(this.linkURL, this.principal);
     let referrerURI = gContextMenuContentData.documentURIObject;
 
@@ -1003,7 +978,6 @@ nsContextMenu.prototype = {
 
     let params = {
       allowMixedContent: persistAllowMixedContentInChildTab,
-      userContextId: parseInt(event.target.getAttribute('data-usercontextid')),
     };
 
     openLinkIn(this.linkURL, "tab", this._openLinkInParameters(params));
@@ -1779,8 +1753,4 @@ nsContextMenu.prototype = {
     menuItem.label = menuLabel;
     menuItem.accessKey = gNavigatorBundle.getString("contextMenuSearch.accesskey");
   },
-  createContainerMenu: function(aEvent) {
-    return createUserContextMenu(aEvent, true,
-                                 gContextMenuContentData.userContextId);
-  },
 };
diff --git a/application/basilisk/base/content/tab-content.js b/application/basilisk/base/content/tab-content.js
index 7441b2140..35ef8ceb2 100644
--- a/application/basilisk/base/content/tab-content.js
+++ b/application/basilisk/base/content/tab-content.js
@@ -886,33 +886,6 @@ var RefreshBlocker = {
 
 RefreshBlocker.init();
 
-var UserContextIdNotifier = {
-  init() {
-    addEventListener("DOMWindowCreated", this);
-  },
-
-  uninit() {
-    removeEventListener("DOMWindowCreated", this);
-  },
-
-  handleEvent(aEvent) {
-    // When the window is created, we want to inform the tabbrowser about
-    // the userContextId in use in order to update the UI correctly.
-    // Just because we cannot change the userContextId from an active docShell,
-    // we don't need to check DOMContentLoaded again.
-    this.uninit();
-
-    // We use the docShell because content.document can have been loaded before
-    // setting the originAttributes.
-    let loadContext = docShell.QueryInterface(Ci.nsILoadContext);
-    let userContextId = loadContext.originAttributes.userContextId;
-
-    sendAsyncMessage("Browser:WindowCreated", { userContextId });
-  }
-};
-
-UserContextIdNotifier.init();
-
 addMessageListener("AllowScriptsToClose", () => {
   content.QueryInterface(Ci.nsIInterfaceRequestor)
          .getInterface(Ci.nsIDOMWindowUtils)
diff --git a/application/basilisk/base/content/tabbrowser.xml b/application/basilisk/base/content/tabbrowser.xml
index 52c51db69..c2f02512d 100644
--- a/application/basilisk/base/content/tabbrowser.xml
+++ b/application/basilisk/base/content/tabbrowser.xml
@@ -814,10 +814,8 @@
                 }
 
                 let unifiedComplete = this.mTabBrowser._unifiedComplete;
-                let userContextId = this.mBrowser.getAttribute("usercontextid") || 0;
                 if (this.mBrowser.registeredOpenURI) {
-                  unifiedComplete.unregisterOpenPage(this.mBrowser.registeredOpenURI,
-                                                     userContextId);
+                  unifiedComplete.unregisterOpenPage(this.mBrowser.registeredOpenURI);
                   delete this.mBrowser.registeredOpenURI;
                 }
                 // Tabs in private windows aren't registered as "Open" so
@@ -825,7 +823,7 @@
                 if (!isBlankPageURL(aLocation.spec) &&
                     (!PrivateBrowsingUtils.isWindowPrivate(window) ||
                     PrivateBrowsingUtils.permanentPrivateBrowsing)) {
-                  unifiedComplete.registerOpenPage(aLocation, userContextId);
+                  unifiedComplete.registerOpenPage(aLocation);
                   this.mBrowser.registeredOpenURI = aLocation;
                 }
               }
@@ -1230,7 +1228,6 @@
                 this._adjustFocusAfterTabSwitch(this.mCurrentTab);
             }
 
-            updateUserContextUIIndicator();
             gIdentityHandler.updateSharingIndicator();
 
             this.tabContainer._setPositionalAttributes();
@@ -1486,7 +1483,6 @@
             var aSkipAnimation;
             var aForceNotRemote;
             var aNoReferrer;
-            var aUserContextId;
             var aRelatedBrowser;
             var aOriginPrincipal;
             var aOpener;
@@ -1507,7 +1503,6 @@
               aSkipAnimation        = params.skipAnimation;
               aForceNotRemote       = params.forceNotRemote;
               aNoReferrer           = params.noReferrer;
-              aUserContextId        = params.userContextId;
               aRelatedBrowser       = params.relatedBrowser;
               aOriginPrincipal      = params.originPrincipal;
               aOpener               = params.opener;
@@ -1530,7 +1525,6 @@
                                   allowMixedContent: aAllowMixedContent,
                                   forceNotRemote: aForceNotRemote,
                                   noReferrer: aNoReferrer,
-                                  userContextId: aUserContextId,
                                   originPrincipal: aOriginPrincipal,
                                   relatedBrowser: aRelatedBrowser,
                                   opener: aOpener });
@@ -1551,7 +1545,6 @@
           let aTargetTab;
           let aNewIndex = -1;
           let aPostDatas = [];
-          let aUserContextId;
           if (arguments.length == 2 &&
               typeof arguments[1] == "object") {
             let params = arguments[1];
@@ -1562,7 +1555,6 @@
             aNewIndex             = typeof params.newIndex === "number" ?
                                     params.newIndex : aNewIndex;
             aPostDatas            = params.postDatas || aPostDatas;
-            aUserContextId        = params.userContextId;
           }
 
           if (!aURIs.length)
@@ -1611,8 +1603,7 @@
               ownerTab: owner,
               skipAnimation: multiple,
               allowThirdPartyFixup: aAllowThirdPartyFixup,
-              postData: aPostDatas[0],
-              userContextId: aUserContextId
+              postData: aPostDatas[0]
             });
             if (aNewIndex !== -1) {
               this.moveTabTo(firstTabAdded, aNewIndex);
@@ -1625,8 +1616,7 @@
             let tab = this.addTab(aURIs[i], {
               skipAnimation: true,
               allowThirdPartyFixup: aAllowThirdPartyFixup,
-              postData: aPostDatas[i],
-              userContextId: aUserContextId
+              postData: aPostDatas[i]
             });
             if (targetTabIndex !== -1)
               this.moveTabTo(tab, ++tabNum);
@@ -1899,7 +1889,7 @@
         <body>
           <![CDATA[
             // Supported parameters:
-            // userContextId, remote, isPreloadBrowser, uriIsAboutBlank, permanentKey
+            // remote, isPreloadBrowser, uriIsAboutBlank, permanentKey
 
             const NS_XUL = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
 
@@ -1911,10 +1901,6 @@
             b.setAttribute("contextmenu", this.getAttribute("contentcontextmenu"));
             b.setAttribute("tooltip", this.getAttribute("contenttooltip"));
 
-            if (aParams.userContextId) {
-              b.setAttribute("usercontextid", aParams.userContextId);
-            }
-
             if (aParams.remote) {
               b.setAttribute("remote", "true");
             }
@@ -1993,7 +1979,7 @@
             "use strict";
 
             // Supported parameters:
-            // forceNotRemote, userContextId
+            // forceNotRemote
 
             let uriIsAboutBlank = !aURI || aURI == "about:blank";
 
@@ -2011,7 +1997,6 @@
             // Private windows are not included because both the label and the
             // icon for the tab would be set incorrectly (see bug 1195981).
             if (aURI == BROWSER_NEW_TAB_URL &&
-                !aParams.userContextId &&
                 !PrivateBrowsingUtils.isWindowPrivate(window)) {
               browser = this._getPreloadedBrowser();
               if (browser) {
@@ -2025,7 +2010,6 @@
               browser = this._createBrowser({permanentKey: aTab.permanentKey,
                                              remote: remote,
                                              uriIsAboutBlank: uriIsAboutBlank,
-                                             userContextId: aParams.userContextId,
                                              relatedBrowser: aParams.relatedBrowser,
                                              opener: aParams.opener});
             }
@@ -2100,7 +2084,6 @@
             var aAllowMixedContent;
             var aForceNotRemote;
             var aNoReferrer;
-            var aUserContextId;
             var aEventDetail;
             var aRelatedBrowser;
             var aOriginPrincipal;
@@ -2123,7 +2106,6 @@
               aAllowMixedContent    = params.allowMixedContent;
               aForceNotRemote       = params.forceNotRemote;
               aNoReferrer           = params.noReferrer;
-              aUserContextId        = params.userContextId;
               aEventDetail          = params.eventDetail;
               aRelatedBrowser       = params.relatedBrowser;
               aOriginPrincipal      = params.originPrincipal;
@@ -2150,11 +2132,6 @@
               t.setAttribute("label", aURI);
             }
 
-            if (aUserContextId) {
-              t.setAttribute("usercontextid", aUserContextId);
-              ContextualIdentityService.setTabStyle(t);
-            }
-
             t.setAttribute("crop", "end");
             t.setAttribute("onerror", "this.removeAttribute('image');");
 
@@ -2204,7 +2181,6 @@
             // of tab.linkedBrowser.
             let browserParams = {
               forceNotRemote: aForceNotRemote,
-              userContextId:  aUserContextId,
               relatedBrowser: aRelatedBrowser,
               opener: aOpener,
             };
@@ -2583,8 +2559,7 @@
             listener.destroy();
 
             if (browser.registeredOpenURI && !aAdoptedByTab) {
-              this._unifiedComplete.unregisterOpenPage(browser.registeredOpenURI,
-                                                       browser.getAttribute("usercontextid") || 0);
+              this._unifiedComplete.unregisterOpenPage(browser.registeredOpenURI);
               delete browser.registeredOpenURI;
             }
 
@@ -2783,11 +2758,6 @@
             if (ourBrowser.isRemoteBrowser != otherBrowser.isRemoteBrowser)
               return;
 
-            // Keep the userContextId if set on other browser
-            if (otherBrowser.hasAttribute("usercontextid")) {
-              ourBrowser.setAttribute("usercontextid", otherBrowser.getAttribute("usercontextid"));
-            }
-
             // That's gBrowser for the other window, not the tab's browser!
             var remoteBrowser = aOtherTab.ownerDocument.defaultView.gBrowser;
             var isPending = aOtherTab.hasAttribute("pending");
@@ -2820,10 +2790,6 @@
               aOurTab.setAttribute("soundplaying", "true");
               modifiedAttrs.push("soundplaying");
             }
-            if (aOtherTab.hasAttribute("usercontextid")) {
-              aOurTab.setUserContextId(aOtherTab.getAttribute("usercontextid"));
-              modifiedAttrs.push("usercontextid");
-            }
             if (aOtherTab.hasAttribute("sharing")) {
               aOurTab.setAttribute("sharing", aOtherTab.getAttribute("sharing"));
               modifiedAttrs.push("sharing");
@@ -2961,8 +2927,7 @@
           <![CDATA[
             // If the current URI is registered as open remove it from the list.
             if (aOurBrowser.registeredOpenURI) {
-              this._unifiedComplete.unregisterOpenPage(aOurBrowser.registeredOpenURI,
-                                                       aOurBrowser.getAttribute("usercontextid") || 0);
+              this._unifiedComplete.unregisterOpenPage(aOurBrowser.registeredOpenURI);
               delete aOurBrowser.registeredOpenURI;
             }
 
@@ -3302,10 +3267,6 @@
           // it in the other window (making it seem to have moved between
           // windows).
           let params = { eventDetail: { adoptedTab: aTab } };
-          if (aTab.hasAttribute("usercontextid")) {
-            // new tab must have the same usercontextid as the old one
-            params.userContextId = aTab.getAttribute("usercontextid");
-          }
           let newTab = this.addTab("about:blank", params);
           let newBrowser = this.getBrowserForTab(newTab);
           let newURL = aTab.linkedBrowser.currentURI.spec;
@@ -4625,7 +4586,6 @@
                                           disableSetDesktopBackground: data.disableSetDesktopBg,
                                           loginFillInfo: data.loginFillInfo,
                                           parentAllowsMixedContent: data.parentAllowsMixedContent,
-                                          userContextId: data.userContextId,
                                         };
               let popup = browser.ownerDocument.getElementById("contentAreaContextMenu");
               let event = gContextMenuContentData.event;
@@ -4652,17 +4612,6 @@
             }
             case "Browser:WindowCreated": {
               let tab = this.getTabForBrowser(browser);
-              if (tab && data.userContextId) {
-                ContextualIdentityService.telemetry(data.userContextId);
-                tab.setUserContextId(data.userContextId);
-              }
-
-	      // We don't want to update the container icon and identifier if
-	      // this is not the selected browser.
-              if (browser == gBrowser.selectedBrowser) {
-                updateUserContextUIIndicator();
-              }
-
               break;
             }
             case "Findbar:Keypress": {
@@ -4845,8 +4794,7 @@
           for (let tab of this.tabs) {
             let browser = tab.linkedBrowser;
             if (browser.registeredOpenURI) {
-              this._unifiedComplete.unregisterOpenPage(browser.registeredOpenURI,
-                                                       browser.getAttribute("usercontextid") || 0);
+              this._unifiedComplete.unregisterOpenPage(browser.registeredOpenURI);
               delete browser.registeredOpenURI;
             }
             let filter = this._tabFilters.get(tab);
@@ -5247,7 +5195,7 @@
       </xul:arrowscrollbox>
     </content>
 
-    <implementation implements="nsIDOMEventListener, nsIObserver">
+    <implementation implements="nsIDOMEventListener">
       <constructor>
         <![CDATA[
           this.mTabClipWidth = Services.prefs.getIntPref("browser.tabs.tabClipWidth");
@@ -5266,17 +5214,9 @@
             this._tabAnimationLoggingEnabled = false;
           }
           this._browserNewtabpageEnabled = Services.prefs.getBoolPref("browser.newtabpage.enabled");
-          this.observe(null, "nsPref:changed", "privacy.userContext.enabled");
-          Services.prefs.addObserver("privacy.userContext.enabled", this, false);
         ]]>
       </constructor>
 
-      <destructor>
-        <![CDATA[
-          Services.prefs.removeObserver("privacy.userContext.enabled", this);
-        ]]>
-      </destructor>
-
       <field name="tabbrowser" readonly="true">
         document.getElementById(this.getAttribute("tabbrowser"));
       </field>
@@ -5302,55 +5242,6 @@
       <field name="_afterHoveredTab">null</field>
       <field name="_hoveredTab">null</field>
 
-      <method name="observe">
-        <parameter name="aSubject"/>
-        <parameter name="aTopic"/>
-        <parameter name="aData"/>
-        <body><![CDATA[
-          switch (aTopic) {
-            case "nsPref:changed":
-              // This is the only pref observed.
-              let containersEnabled = Services.prefs.getBoolPref("privacy.userContext.enabled");
-
-              const newTab = document.getElementById("new-tab-button");
-              const newTab2 = document.getAnonymousElementByAttribute(this, "anonid", "tabs-newtab-button")
-
-              if (containersEnabled) {
-                for (let parent of [newTab, newTab2]) {
-                  if (!parent)
-                    continue;
-                  let popup = document.createElementNS(
-                                "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul",
-                                "menupopup");
-                  if (parent.id) {
-                    popup.id = "newtab-popup";
-                  } else {
-                    popup.setAttribute("anonid", "newtab-popup");
-                  }
-                  popup.className = "new-tab-popup";
-                  popup.setAttribute("position", "after_end");
-                  parent.appendChild(popup);
-
-                  gClickAndHoldListenersOnElement.add(parent);
-                  parent.setAttribute("type", "menu");
-                }
-              } else {
-                for (let parent of [newTab, newTab2]) {
-                  if (!parent)
-                    continue;
-                  gClickAndHoldListenersOnElement.remove(parent);
-                  parent.removeAttribute("type");
-                  if (!parent.firstChild)
-                    continue;
-                  parent.firstChild.remove();
-                }
-              }
-
-              break;
-          }
-        ]]></body>
-      </method>
-
       <property name="_isCustomizing" readonly="true">
         <getter>
           let root = document.documentElement;
@@ -6451,7 +6342,6 @@
             inBackground = !inBackground;
 
           let targetTab = this._getDragTargetTab(event, true);
-          let userContextId = this.selectedItem.getAttribute("usercontextid");
           let replace = !!targetTab;
           let newIndex = this._getDropIndex(event, true);
           let urls = links.map(link => link.url);
@@ -6461,7 +6351,6 @@
             allowThirdPartyFixup: true,
             targetTab,
             newIndex,
-            userContextId,
           });
         }
 
@@ -6722,14 +6611,6 @@
       -->
       <field name="muteReason">undefined</field>
 
-      <property name="userContextId" readonly="true">
-        <getter>
-          return this.hasAttribute("usercontextid")
-                   ? parseInt(this.getAttribute("usercontextid"))
-                   : 0;
-        </getter>
-      </property>
-
       <property name="soundPlaying" readonly="true">
         <getter>
           return this.getAttribute("soundplaying") == "true";
@@ -6857,27 +6738,6 @@
         ]]>
         </body>
       </method>
-
-      <method name="setUserContextId">
-        <parameter name="aUserContextId"/>
-        <body>
-        <![CDATA[
-          if (aUserContextId) {
-            if (this.linkedBrowser) {
-              this.linkedBrowser.setAttribute("usercontextid", aUserContextId);
-            }
-            this.setAttribute("usercontextid", aUserContextId);
-          } else {
-            if (this.linkedBrowser) {
-              this.linkedBrowser.removeAttribute("usercontextid");
-            }
-            this.removeAttribute("usercontextid");
-          }
-
-          ContextualIdentityService.setTabStyle(this);
-        ]]>
-        </body>
-      </method>
     </implementation>
 
     <handlers>
@@ -7054,30 +6914,9 @@
     <handlers>
       <handler event="popupshowing">
       <![CDATA[
-        if (event.target.getAttribute("id") == "alltabs_containersMenuTab") {
-          createUserContextMenu(event);
-          return;
-        }
-
-        let containersEnabled = Services.prefs.getBoolPref("privacy.userContext.enabled");
-
-        if (event.target.getAttribute("anonid") == "newtab-popup" ||
-            event.target.id == "newtab-popup") {
-          createUserContextMenu(event);
-        } else {
-          document.getElementById("alltabs-popup-separator-1").hidden = !containersEnabled;
-          let containersTab = document.getElementById("alltabs_containersTab");
-
-          containersTab.hidden = !containersEnabled;
-          if (PrivateBrowsingUtils.isWindowPrivate(window)) {
-            containersTab.setAttribute("disabled", "true");
-          }
-
           document.getElementById("alltabs_undoCloseTab").disabled =
             SessionStore.getClosedTabCount(window) == 0;
 
-          var tabcontainer = gBrowser.tabContainer;
-
           // Listen for changes in the tab bar.
           tabcontainer.addEventListener("TabAttrModified", this, false);
           tabcontainer.addEventListener("TabClose", this, false);
@@ -7094,9 +6933,6 @@
 
       <handler event="popuphidden">
       <![CDATA[
-        if (event.target.getAttribute("id") == "alltabs_containersMenuTab") {
-          return;
-        }
 
         // clear out the menu popup and remove the listeners
         for (let i = this.childNodes.length - 1; i > 0; i--) {
@@ -7105,9 +6941,6 @@
             menuItem.tab.mCorrespondingMenuitem = null;
             this.removeChild(menuItem);
           }
-          if (menuItem.hasAttribute("usercontextid")) {
-            this.removeChild(menuItem);
-          }
         }
         var tabcontainer = gBrowser.tabContainer;
         tabcontainer.mTabstrip.removeEventListener("scroll", this, false);
diff --git a/application/basilisk/base/content/utilityOverlay.js b/application/basilisk/base/content/utilityOverlay.js
index 38ca82f55..c8d85212f 100644
--- a/application/basilisk/base/content/utilityOverlay.js
+++ b/application/basilisk/base/content/utilityOverlay.js
@@ -5,7 +5,6 @@
 
 // Services = object with smart getters for common XPCOM services
 Components.utils.import("resource://gre/modules/AppConstants.jsm");
-Components.utils.import("resource://gre/modules/ContextualIdentityService.jsm");
 Components.utils.import("resource://gre/modules/Services.jsm");
 Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
 Components.utils.import("resource://gre/modules/PrivateBrowsingUtils.jsm");
@@ -176,7 +175,6 @@ function whereToOpenLink( e, ignoreButton, ignoreAlt )
  *   skipTabAnimation     (boolean)
  *   allowPinnedTabHostChange (boolean)
  *   allowPopups          (boolean)
- *   userContextId        (unsigned int)
  */
 function openUILinkIn(url, where, aAllowThirdPartyFixup, aPostData, aReferrerURI) {
   var params;
@@ -222,7 +220,6 @@ function openLinkIn(url, where, params) {
   var aAllowPinnedTabHostChange = !!params.allowPinnedTabHostChange;
   var aNoReferrer           = params.noReferrer;
   var aAllowPopups          = !!params.allowPopups;
-  var aUserContextId        = params.userContextId;
   var aIndicateErrorPageLoad = params.indicateErrorPageLoad;
   var aPrincipal            = params.originPrincipal;
   var aTriggeringPrincipal  = params.triggeringPrincipal;
@@ -268,7 +265,6 @@ function openLinkIn(url, where, params) {
   function useOAForPrincipal(principal) {
     if (principal && principal.isCodebasePrincipal) {
       let attrs = {
-        userContextId: aUserContextId,
         privateBrowsingId: aIsPrivate || (w && PrivateBrowsingUtils.isWindowPrivate(w)),
       };
       return Services.scriptSecurityManager.createCodebasePrincipal(principal.URI, attrs);
@@ -315,17 +311,12 @@ function openLinkIn(url, where, params) {
                                  createInstance(Ci.nsISupportsPRUint32);
     referrerPolicySupports.data = aReferrerPolicy;
 
-    var userContextIdSupports = Cc["@mozilla.org/supports-PRUint32;1"].
-                                 createInstance(Ci.nsISupportsPRUint32);
-    userContextIdSupports.data = aUserContextId;
-
     sa.appendElement(wuri, /* weak =*/ false);
     sa.appendElement(charset, /* weak =*/ false);
     sa.appendElement(referrerURISupports, /* weak =*/ false);
     sa.appendElement(aPostData, /* weak =*/ false);
     sa.appendElement(allowThirdPartyFixupSupports, /* weak =*/ false);
     sa.appendElement(referrerPolicySupports, /* weak =*/ false);
-    sa.appendElement(userContextIdSupports, /* weak =*/ false);
     sa.appendElement(aPrincipal, /* weak =*/ false);
     sa.appendElement(aTriggeringPrincipal, /* weak =*/ false);
 
@@ -418,8 +409,7 @@ function openLinkIn(url, where, params) {
       flags: flags,
       referrerURI: aNoReferrer ? null : aReferrerURI,
       referrerPolicy: aReferrerPolicy,
-      postData: aPostData,
-      userContextId: aUserContextId
+      postData: aPostData
     });
     browserUsedForLoad = aCurrentBrowser;
     break;
@@ -438,7 +428,6 @@ function openLinkIn(url, where, params) {
       skipAnimation: aSkipTabAnimation,
       allowMixedContent: aAllowMixedContent,
       noReferrer: aNoReferrer,
-      userContextId: aUserContextId,
       originPrincipal: aPrincipal,
       triggeringPrincipal: aTriggeringPrincipal,
     });
@@ -482,74 +471,6 @@ function checkForMiddleClick(node, event) {
   }
 }
 
-// Populate a menu with user-context menu items. This method should be called
-// by onpopupshowing passing the event as first argument.
-function createUserContextMenu(event, isContextMenu = false, excludeUserContextId = 0) {
-  while (event.target.hasChildNodes()) {
-    event.target.removeChild(event.target.firstChild);
-  }
-
-  let bundle = document.getElementById("bundle_browser");
-  let docfrag = document.createDocumentFragment();
-
-  // If we are excluding a userContextId, we want to add a 'no-container' item.
-  if (excludeUserContextId) {
-    let menuitem = document.createElement("menuitem");
-    menuitem.setAttribute("data-usercontextid", "0");
-    menuitem.setAttribute("label", bundle.getString("userContextNone.label"));
-    menuitem.setAttribute("accesskey", bundle.getString("userContextNone.accesskey"));
-
-    // We don't set an oncommand/command attribute because if we have
-    // to exclude a userContextId we are generating the contextMenu and
-    // isContextMenu will be true.
-
-    docfrag.appendChild(menuitem);
-
-    let menuseparator = document.createElement("menuseparator");
-    docfrag.appendChild(menuseparator);
-  }
-
-  ContextualIdentityService.getIdentities().forEach(identity => {
-    if (identity.userContextId == excludeUserContextId) {
-      return;
-    }
-
-    let menuitem = document.createElement("menuitem");
-    menuitem.setAttribute("data-usercontextid", identity.userContextId);
-    menuitem.setAttribute("label", ContextualIdentityService.getUserContextLabel(identity.userContextId));
-
-    if (identity.accessKey) {
-      menuitem.setAttribute("accesskey", bundle.getString(identity.accessKey));
-    }
-
-    menuitem.classList.add("menuitem-iconic");
-    menuitem.setAttribute("data-identity-color", identity.color);
-
-    if (!isContextMenu) {
-      menuitem.setAttribute("command", "Browser:NewUserContextTab");
-    }
-
-    menuitem.setAttribute("data-identity-icon", identity.icon);
-
-    docfrag.appendChild(menuitem);
-  });
-
-  if (!isContextMenu) {
-    docfrag.appendChild(document.createElement("menuseparator"));
-
-    let menuitem = document.createElement("menuitem");
-    menuitem.setAttribute("label",
-                          bundle.getString("userContext.aboutPage.label"));
-    menuitem.setAttribute("accesskey",
-                          bundle.getString("userContext.aboutPage.accesskey"));
-    menuitem.setAttribute("command", "Browser:OpenAboutContainers");
-    docfrag.appendChild(menuitem);
-  }
-
-  event.target.appendChild(docfrag);
-  return true;
-}
-
 // Closes all popups that are ancestors of the node.
 function closeMenus(node)
 {