All this talk of syncing & duplicate bookmarks doesn't explain what happened during the last update of Firefox Quantum (64-bit). I don't have multiple devices, so where are all these bookmarks & empty duplicate folders coming from. There are a bunch of bookmarks outside of the folders they were in AND inside the folders they're in. What the heck happened? Can I go back to the previous version of Firefox? This is a mess, and I really don't have time to read through a gazillion links trying to rectify this issue. I've restored my bookmarks to before this latest update occurred, and it seems to be making things worse. Mozilla needs to post BIG FAT FLAGS when they make a major change to this browser. I would've never let this update install, had I known what it was going to do. Because I embed folders inside of folders, all the loose ones used to belong inside of folders, and some didn't. Now, I have tons of them where I can't find which folder they were in, because they were embedded. This is really bad, whatever Firefox has done. Again, 1 computer, 1 device ... WHAT IS IT DOING or syncing to? I'm not using some Add-on to fix this, because an Add-on didn't break it; the last update did! I do have Add-ons, but unless this version is incompatible with them, I have no clue. None of them are bookmark Add-ons anyway. I shan't Share Data this time, because I really don't want people poking around & pointing fingers at my Add-ons. I'd rather be shown how to go back to the previous version, than keep messing around with incompatibilities when Firefox keeps changing. Developers can't keep up with all these updates that come through every other month (it seems). Please and thank you.