Created attachment 8340404 [details] Test add-on User Agent: Mozilla/5.0 (Windows NT 6.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36 Steps to reproduce: I made an extension that adds a new toolbar with one menu button, associated a context menu for each menuitem of that menu, and added a tooltip to each menuitem of the context menu. 1) Click on toolbar button, menu appears. 2) Right click on a menuitem, context menu appears. 3) Mouse over the part of the context menu which overlaps with the main menu Actual results: The context menuitem which was moused over doesn't highlight correctly (highlights for a moment then disappears) and its tooltip doesn't appear at all. The problem only occurs where the context menu overlaps with the main menu. I.e., if I mouse over the part of the context menu which does not overlap with the main menu, everything works fine. Also, the highlighting problem goes away when I get rid of the tooltiptext attributes.
Did it use to work with previous versions of Firefox? I tested with Firefox 17 (to see if a regression was possible) and the add-on is flagged as incompatible. Is it normal? (maybe change the manifest to allow all versions) In addition, I tested with Firefox 28 and its new them Australis, your toolbar is totally broken, no toolbar button.
I created the test add-on for Firefox 25. The button doesn't have an icon so you can only see it if you customize your toolbars to show text. I don't know why the button doesn't appear in the toolbar in Nightly. In any case, you should be able to find a button called "File" when you go to Customize. Put it on any toolbar and you'll still see the same results mentioned. I'll update the manifest to allow all versions.
Created attachment 8340441 [details] Test add-on revised
Created attachment 8340443 [details] Test add-on (revised)
I tested with FF8, same issue, so no regression, I guess.