It's a bit weird, I got the thing you get when you migrate to a new browser - asking if you'd like to migrate history and bookmarks. I closed it because I've used firefox for years. When firefox opened proper, I got a tab asking to restore the previous session, along with a "Welcome to firefox" tab. As well I got a few popups for other things, basically just stuff you see when you open firefox for the first time. A couple of extensions opened up a landing page that should only open when you first install them. All my bookmarks and browser history is there. The settings have all been reset to default. The extensions are there but all of their storage seems to be gone, like my dark reader extension no longer has the exception sites on it. Ublock has the ad count reset and most importantly all my custom rules are gone! I have spent years making hundreds of custom rules, and quite a few took hours to get right. I am sad about losing that. Does anyone know what might have happened? When I was looking at my about:config to see I saw these things in the modified settings. there's quite a few settings here and IDK which are relevant. The ones in the pictures where just the first couple and I show them because they seem to have something to do with this situation "auto migrated" - when it seems like the browser did this because it thinks it migrated, the first screen I got was asking if I'd like to transfer my bookmarks and history (and good thing I closed it,or it might have deleted those too).