After preferences have been opened and closed, instead of folding back into the menu bar a grey square stays in the far left hand corner of my screen. This is then replicated on every screen. I can't seem to solve this, any ideas?
After using the preference pane, it does not fold away back into the finder bar but leaves a grey square in the top left corner of the screen. When I switch to another screen within spaces, the grey square still appears.
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This may be caused by a malfunctioing add-on. Try the procedure in this link to see if it helps - https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes
I have the exact same problem.. I tried disabling all add-ons and I'm only using the default theme... still no change. Whenever I close the preferences window it becomes an obtrusive grey square in the top left corner of the screen. It even obscures other open applications and won't disappear until I quit Firefox...
The problem may be with the FoxTab extension, that one is known to leave a small square by the Firefox button. If you have that one try uninstalling it.
I don't have the FoxTab extension, and in fact I have now uninstalled all add-ons..
...but the problem persists. The grey square seems to be left behind after closing the Preferences box (either by clicking OK or Cancel)