Just lost all my firefox extensions

This happened to me, also. I don't know what is happening with Firefox lately, but it is nowhere as stable as earlier versions. I also lost my bookmarks at three times. I was able to restore, but it is a giant pain to keep fixing. I am looking at switching over to Opera, or another browser.

 

I had nothing but problems with FF3 after doing an upgrade from FF2. The fix was to uninstall it, delete ALL the FF folders on the system and do an install from squeaky clean. Not sure what they did, but they made an utter hash out of it for upgrades.

Zero problems with it since starting over.

 

I've been using Google Chrome, but opened Mozilla Firefox, and all my extensions are still there, so works for me.

 

I've never had problems with losing them, but here is what I do about every 3-4 weeks, back everything up with "MozBackup" it does passwords, bookmarks, extensions, cache, history, themes. Pretty much everything you tell it to. If you need to format and start from scratch, just import a 'backup' and you're back to normal. Or in your case of losing them just bring them back.

http://mozbackup.jasnapaka.com/