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A forum thread[1] suggests it may be possible to use the profile refresh functionality to recover most of the profile. Only problem is that it does not preserve extensions or settings.

[1]: http://forums.mozillazine.org/viewtopic.php?f=38&t=3032457

What does it preserve, then? (Bookmarks? That's the easy thing to restore. Transfer to another browser then transfer back.)

This link should clarify what is preserved by the refresh.

https://support.mozilla.org/en-US/kb/refresh-firefox-reset-a...

I believe this has something to do with moving favicons out of places.sqlite and into favicons.sqlite. This completely destroyed my favicons (thousands) SeaMonkey's Bookmark Manager (and search history going back years).

If Firefox Sync can sync the important bits of your profile, that may be a sufficient solution to this problem?