Comment 70 for bug 872207

Well, the same symptoms as I was getting (a lot more frequently) on Oneiric. I only regraded this machine to Precise last week.

We use the Cookie Swap extension, which has a popup menu to facilitate swapping between cookie sets. Clicking on the toolbar item to trigger the menu exhibits the same symptoms as this described in this bug. When this particular menu has been exhibiting these symptoms in the past, I also noticed other Firefox menus suffering from the same fate. Though yesterday evening I did not test any other menus, I just went for the workaround.

The same workaround worked: dragging the Firefox window from Maximized and releasing it (and then re-Maximizing it and continuing to browse as normal).

So I'm fairly sure this is the same bug. Obviously if (when) it happens again, I'll try to remember to test other menus and post the results.