All the items you're talking about are stored in profiles, for which it's generally understood (although not communicated well) that any particular nightly will blow away. I've had success with saving the bookmarks and some other data in \windows\application data\mozilla\profiles, restoring some of those files in the newly installed profiles directory each time. Of course on the Mac this data will be stored elsewhere.
It is also generally expected that the nightly builds will be buggy as this is where new code is being checked in every day. Running 2002020803, I have see a few, including two crashes.
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