For some reason, the last time I moved my Thunderbird profile, it didn’t work very well.
Firefox is very easy to move; I just drag the whole Firefox folder from my back up to the Library folder in Finder (Mac OS X). Thunderbird used to work that way as well.
I found this article explaining the proper way to move a profile:
Moving your profile folder
Make sure to also check out the article on how to start the profile manager too:
Accessing the Profile Manager
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