I used the profile thingy to go from one OS to the other and I think there were no additional steps (or at least they were unsignificant enough so that I dont remember them).

It’s a bit clunky, i think there’s 2 directories to copy/paste, one for profile, one for cache (though 2nd one is probably optional), and i remember having to erase some manually when i choose wrong folder when copying. From Firefox about:profile page, you can open the folder it’s actually using as profile folder to avoid confusion.

Locking for rule 5.