Backed out changeset 0851acd8fd1e (bug 1491906) for clipboard failures in browser/base/content/test/general/browser_clipboard.js CLOSED TREE

browser/base/content/browser.xul

@@ -1292,7 +1292,7 @@ xmlns="http://www.w3.org/1999/xhtml"
         <tabbox id="tabbrowser-tabbox"
                 flex="1" tabcontainer="tabbrowser-tabs">
           <tabpanels id="tabbrowser-tabpanels"
-                     flex="1" class="plain" selectedIndex="0" async="true"/>
+                     flex="1" class="plain" selectedIndex="0"/>
         </tabbox>
       </vbox>
       <vbox id="browser-border-end" hidden="true" layer="true"/>

toolkit/content/widgets/tabbox.xml

@@ -401,11 +401,7 @@
 
           var panel = this._selectedPanel;
           this._selectedPanel = this.children[val];
-
-          if (this.getAttribute("async") != "true") {
           this.setAttribute("selectedIndex", val);
-          }
-
           if (this._selectedPanel != panel) {
             var event = document.createEvent("Events");
             event.initEvent("select", true, true);