Firefox has spontaneously decided not to show the task bar at the bottom of the screen, and some menu bars have been messed up. How can I fix this?

My Firefox has spontaneously (apparently) decided not to show the task bar at the bottom of the screen (the margin is there, but it is blank), and some menu bars have been messed up. Perhaps the most annoying aspect of these changes is the fact that I have to use alt-tab to move from a Firefox session to another session.
I can find no way to fix these problems. Can you help? Am I going to have to uninstall and re-install Firefox in order to get back to the default settings? If so, is there any way to preserve my bookmarks?

Make sure that you do not run Firefox in full screen mode (press F11 or Fn + F11 to toggle; Mac: command+Shift+F).<br />
If you are in full screen mode then hover the mouse to the top to make the Navigation Toolbar and Tab bar appear.<br />
You can click the Maximize button at the top right to leave full screen mode or right click empty space on a toolbar and use "Exit Full Screen Mode" or press F11.
*https://support.mozilla.org/kb/how-to-use-full-screen
See also:
*http://kb.mozillazine.org/Corrupt_localstore.rdf
*https://support.mozilla.org/kb/Toolbar+keeps+resetting

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The ! usually means that the song file has been moved or deleted. If you can find the song file on your hard drive, you can remove the song from iTunes and put it back by using File>Open and navigating to the song file. There is also a location that iTunes will look for song files (I'm a Mac guy, so I don't know where it should be in Windows, but for me it's HD>Users>My User Name>Music>iTunes>iTunes Music and then there are various folders for different albums, podcasts, etc.), so I would keep them all there.

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Thanks for that advice @randers4.
I linked through and submitted my info as a "topic not covered" in the iCloud section. After entering the serial number of my MBP it turns out I wasn't eligible for technical support (though I don't think this is hardware related support) and the final suggestion was to take my computer into an Apple store. I called my local Apple reseller and asked for assistance. The customer service rep was very nice but unable to help, so suggested I call Apple Support on 1300 321 456. I did so and, again, spoke to two very polite and helpful customer service people (I was transferred to security services). I didn't have to be on hold to speak to either rep for more than a few seconds! After trying a few different things, he worked out what was happening...
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Message was edited by: NotBaconBits

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iMovie works best with uncompressed audio. If your track is MP3 or AAC, you may get better results by converting your track to the AIFF format and then using that in iMovie.
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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
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Firefox has spontaneously decided not to show the task bar at the bottom of the screen, and some menu bars have been messed up. How can I fix this?

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