Hey since we're doing these, how about the years-old bug where ff won't remember which bookmark folder you were in previously when opening new bookmarks. If you have bookmark folders (especially nested ones), try opening a bookmark inside one of those folders. Then go back into your bookmarks, you'll see you're not in that folder anymore, you're at the root level and have to traverse your folders to get back to where you were. It's super annoying if you're opening bookmarks one after another.