Re: Everything's gone. Everything.
The only things it's imported are my Bookmarks and logins - the same as Chrome and Edge do when migrating.
All my addons are gone without any warning, and all my customisation is gone - eg "Pocket" is suddenly back in the address bar, download history is gone completely.
It no longer asks where to save downloads, and I'm even now finding further settings it has reset. Some of them don't appear to even exist anymore.
Heck, I can't even find what it did to Download History. Or even the most recent download.