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#11
Actually the arrow is on the page you were browsing at the time, some illustrated instructions on how to import in Edge. :)
Have you tried my suggestion of testing the import works in another account? I created a new test user for the purpose, so that I knew all the settings were fresh and uncorrupted (and deleted it after I'd finished testing).
If it works in another account then you may need to repair the Firefox profile in you main account before you can import from it.