When I downloaded Mozilla Firefox 4.0 Beta 10 I lost all my Bookmarks. I went back to using the older version and get the message that it is no longer supported or covered by virus protection. Why did I lose my Bookmarks?

Why did I lose my Bookmarks?

Clarification:
I believe now you potentially lose all extensions, plug-ins when you use the new reset function, but you will let me know.
If that is the case, your find corrupt file method maybe better. However, I reviewed the two help articles and there appear to be more files than just the delete search.json file and a possible search.sqlite file in the Firefox Profile Folder. I am confused. Then I have to find the folders. I think help articles mentioned how to find the profile containing the files, but not sure.

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