Bug 986377 - Double the test timeout

browser/components/tabview/test/browser_tabview_bug598600.js

@@ -5,6 +5,7 @@ let newWin;
 function test() {
   let ss = Cc["@mozilla.org/browser/sessionstore;1"].getService(Ci.nsISessionStore);
 
+  requestLongerTimeout(2);
   waitForExplicitFinish();
 
   // open a new window and setup the window state.