Sometimes the screen is full-screen or smaller than minimum, same for Thunderbird

Every now and then the window-size is collapsed, and can only be maximized. (Firefox 8.0)
This also happens at Thunderbird 8.0

You could try using Firefox's Safe Mode to reset your toolbars. Not sure whether this is a toolbar problem, but it's probably worth a try.
First, I recommend backing up your Firefox settings in case something goes wrong. See [https://support.mozilla.com/en-US/kb/Backing+up+your+information Backing up your information]. (You can copy your entire Firefox profile folder somewhere outside of the Mozilla folder.)
Next, check this article on how to start Firefox in
[https://support.mozilla.com/kb/Safe+Mode Safe Mode] and use the dialog to reset toolbars.
Any luck?

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