Fixes #4196: Firefox 3: extra MENUPOPUPEND event when using Dojo context menu.
Fixes #4196: Firefox 3: extra MENUPOPUPEND event when using Dojo context menu.

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@10704 560b804f-0ae3-0310-86f3-f6aa0a117693

kitsonk/delite,Sam-Cummins/delite,Sam-Cummins/delite,harbalk/delite,harbalk/delite,kitsonk/delite