Issue 3465 - Don`t access content document when opening new tab

lib/appSupport.js

Index: lib/appSupport.js
===================================================================
--- a/lib/appSupport.js
+++ b/lib/appSupport.js
@@ -222,17 +222,17 @@ switch (application)
       return (window.document.documentElement.getAttribute("windowtype") == "navigator:browser");
     };
 
     exports.getBrowser = (window) => window.gBrowser;
 
     exports.addTab = function ff_addTab(window, url, event)
     {
       if (event)
-        window.openNewTabWith(url, exports.getBrowser(window).contentDocument, null, event, false);
+        window.openNewTabWith(url, null, null, event, false);
       else
         window.gBrowser.loadOneTab(url, {inBackground: false});
     };
 
     exports.contentContextMenu = "contentAreaContextMenu";
 
     exports.defaultToolbarPosition = {
       parent: "nav-bar"
@@ -270,17 +270,17 @@ switch (application)
     {
       let type = window.document.documentElement.getAttribute("windowtype");
       return (type == "navigator:browser" || type == "mail:3pane" || type == "mail:messageWindow");
     };
 
     exports.addTab = function sm_addTab(window, url, event)
     {
       if (event || !("gBrowser" in window))
-        window.openNewTabWith(url, ("gBrowser" in window ? window.gBrowser.contentDocument : null), null, event, false);
+        window.openNewTabWith(url, null, null, event, false);
       else
         window.gBrowser.loadOneTab(url, {inBackground: false});
     };
 
     exports.getBrowser = function sm_getBrowser(window)
     {
       if ("gBrowser" in window)
         return window.gBrowser;