How do I uninstall firefox 4 and get back to firefox 3.6.13?

I installed firefox 4 to play applications in Face Book. It keeps crashing. I never had this problem with firefox 3.6.13. I can't get any help why firefox 4 keeps crashing in the middle of the games, this happens constantly. So now I want to uninstall firefox 4 and reinstall firefox 3.6.13 until I can figure out why firefox 4 keeps crashing all the time. When it crashes, it always says application did not leave a crash dump report or something to that affect. So, if someone could please tell me how to uninstall firefox 4 and reinstall firefox 3.6.13, I would be grateful. But I'd also like to get some answers as to why firefox 4 keeps crashing constantly. I've been at this for over a week now, and can't any answers. The stock questions and replies I read are no help what so ever.
Thanks. I would appreciate if someone would email the answer or reply. [email protected] Every time I look for my questions that I have asked, I can't find them!! So I can't tell if anyone has replied or answered my questions anyway. So, if someone would email I would again appreciate it. Again, my email address is: [email protected] Thanks.
The Box containing "This happened" I put Every time Firefox opened because the ones do not apply. But it doesn't happen everytime firefox opens, just when I'm playing in my games in Face Book, sometimes as soon as I load a game, sometimes in the of the game, and mostly when I visit neighbors.

For uninstalling Firefox 4 see https://support.mozilla.com/kb/Uninstalling+Firefox
Make sure you do not select the option to "Remove my Firefox personal data" as that option will delete all of your bookmarks, passwords etc.
You can re-install Firefox 3.6.15 from http://www.mozilla.com though judging by your user agent string you still have 3.6.15 installed.

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