Bug 139877. Right click context menu accesskeys require 'Enter' to perform action (regression). Fix by Kyle Yuan. r=aaronl, sr=jst

content/shared/public/nsXULAtomList.h

@@ -316,3 +316,4 @@ XUL_ATOM(defaultz, "default")
 XUL_ATOM(screenX, "screenX")
 XUL_ATOM(screenY, "screenY")
 XUL_ATOM(hidechrome, "hidechrome")
+XUL_ATOM(popupset, "popupset")

layout/xul/base/src/nsMenuPopupFrame.cpp

@@ -1508,7 +1508,8 @@ nsMenuPopupFrame::FindMenuWithShortcut(nsIDOMKeyEvent* aKeyEvent, PRBool& doActi
     nsCOMPtr<nsIAtom> tag;
     parentContent->GetTag(*getter_AddRefs(tag));
     // toolbarbutton is for the "Bookmarks" button on the toolbar
-    if (tag == nsXULAtoms::menu || tag == nsXULAtoms::toolbarbutton) 
+    // popupset is for the right-click popup menu
+    if (tag == nsXULAtoms::menu || tag == nsXULAtoms::toolbarbutton || tag == nsXULAtoms::popupset)
       isMenu = PR_TRUE;
   }