(This issue has been ongoing for several versions now. I've uninstalled and reinstalled, and tried safe mode.)
The right click menu, within the menu bar drop down menus, disappears as soon as I move the mouse. Making it impossible to select anything from it.
For example: I click "Bookmarks" in the menu bar and get a drop down window of all my bookmarks. I then mouse over a bookmark and right click to get the drop down menu that will let me "Open", "Open in new Window", "Open in new Tab", etc... As soon as I move the mouse, this menu disappears. I cannot mouse over it to make a selection.
If I don't move the mouse I can use the arrow keys to make a selection and then hit enter.
Start Firefox in Troubleshoot Firefox issues using Safe Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
3.6.10 dutch is the first version in which I have encountered this.
The safe mode trick didn't fix it for me.
It happened while right clicking a link in a wikipedia page (I was looking for Open in a new tab).
It appears to be intermittent. After a while within one Firefox session, it went away. I have been able to reproduce a few times, but for now it's gone alltogether.
While I was experiencing the problem, I switched to Windows explorer. Much to my surprise, I couldn't use right click in explorer aswell! After the situation went away (intermittent) I could use right click in both Firefox and explorer (I know this one sounds like a UFO sighting, and maybe it's an OS problem (Vista Ultimate, Dutch), but maybe it's a Firefox problem that extends outside Firefox because of some shady Windows event hook thingy).
Hope this helps finding the bug.
Yeah. It still does it in safe mode.
Unlike Bezz, mine only does it in the drop down menus, which are within the drop down menus of the "Menu Bar" (File, Edit, View, History, Bookmarks, Tools, Help.
Right click works fine the rest of the time. It's only when I open something on the menu bar, and then right click on one of the selections (like you'd do to delete a bookmark).
No news on this?
I'm on Ubuntu 10.10 and experience this extremely annoying bug. All the menus, and popup (right-click) menus disappear as soon as the mouse hovers over the menu.
But that is only when the bug is "active". No idea wha (de)activates the bug.
Firefox 4 - Ubuntu 10.10 x64
Same bug as Bendikro. Suddenly my right click menus stop working. I right click, the menu pops up but as soon as the mouse hovers over the menu it dissapears (the menu). Restarting Firefox seems to solve the problem.
I have the same problem as vedster above except it doesn't cure itself after restarting FF or rebooting, 2.6.35-28-generic #49-Ubuntu, Mozilla firefox 4.0 canonical - 1.0. It is also not working by left clicking on a menu item (Toolbar, File, Edit), it opens the sub menu but as soon as I move the mouse it disappears. I have uninstalled all addons, but .9RC2 stills shows up as not compatible with 4.0 but it is disabled. Maybe something is lthere is casuing my problem since it was a upgrade and not a fresh install.
If I load safemode it corrects the problem. I have removed flash but still encounter the sub menu disappearing after left click and as soon as mouse movement is detected the sub menu drop down closes. I need to use keyboard after right clicking. PIA
I have also renamed the hidden mozilla folder and mozilla creates a repalcement, but FF will not start with the replacement hidden folder, so I moved the old one back and everything is fine except for the right and left mouse and submenus disappearing.
I have the same problem. However, I thought there might be a correlation between Thunderbird and Firefox. I usually have both open. Well the menu in Thunderbird was disappearing. I closed Firefox and the menu was fine. Later the reverse happened, Firefox menu was disappearing. Closed Thunderbird and menu is fine. Curious isn't it?