Aaahhhh What The Faaaaaa!!!!

This is the third fvcking time that I've turned on my computer, went on to firefox, and found all my bookmarks and settings erased.

What the fvck is going on? I loose my bookmarks, saved passwords, cookies, settings, icons, everything.

Are you sure "Always clear my private data when I close Firefox" is unchecked in the settings?

Yeah, because this doesn't happen all the time. This is the third time in maybe two weeks that it's done this.

Sorry I don't exactly know what to tell ya buddy. I suggest visiting the Firefox website or googling to find out the problem. It may potentially be a problem with an extension in your Firefox so I'd suggest opening a few pages (for the History to catch), closing Firefox, opening it in Safe Mode (which uses no extensions) and seeing if it has worked.

Sounds like you might have an issue with your profiles...

http://www.mozilla.org/support/firefox/profile

Check that link out.

You might also want to install Googles browser sync, to recover next time

http://www.google.com/tools/firefox/browsersync/

Yeah this happens to me too sometimes, but only after firefox upgrades... I know other people get the same problem when they upgrade too.