Firefox extensions disappeared after a program crash. Can't install new ones. What should I do? Thanks.?

I was installing a extension ("add bookmark here"). I might clicked on "install" twice, so it was installed twice. Then the computer froze. I had to press the power button to shut down and restart. Then all my existing extensions disappeared. Nothing happens when I install new ones. I uninstalled and reinstalled firefox twice, and the problem persists.

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hmmm odd one???
you might want to check your OS is running ok. iv had it were it kick my extensions off befor, but always let me reinstall them, any luck on the firefox website?
try installing a differnt vertion of firefox, that way you can see if its Firefox of your OS.

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