I'm switching from firefox to librewolf on mac, and when I open the "import data" menu on librewolf I can't find the "import from firefox" option. Screenshot above.
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You should be able to export your login information from Firefox to a file as well.
I don't know if there is much you can do with extensions. You might be able to find where the data is saved and click and drag or use your Firefox login but I'd probably just grab them like you do a regular Firefox extension.