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I got the Beta version, but it wouldn't let me sign into deviantART so I uninstalled it!

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I can't find any of the backup files ANYWHERE! I need those bookmarks! I've tried doing what it said in the troubleshooting thing, but it doesn't work! All that I wanted to do was check my messages on dA. But Firefox deleted all of my bookmarks after uninstalling the beta 4 thing. My profile is gone, and so are my bookmarks along with the backup.

I can't find any of the backup files ANYWHERE! I need those bookmarks! I've tried doing what it said in the troubleshooting thing, but it doesn't work! All that I wanted to do was check my messages on dA. But Firefox deleted all of my bookmarks after uninstalling the beta 4 thing. My profile is gone, and so are my bookmarks along with the backup.

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If you selected the option to "Remove my Firefox personal data and customizations" when uninstalling Firefox 4.0 beta, you deleted your entire Profile folder set.

You're going to need a file recovery program like Recuva to try to recover those files.