I have 4 macbooks and iphone w. about 10000-19000 bookmarks. Last n. I noticed what I bookmarked on 1 machine wouldn't show on another. A pop up said "your profile has reached a limit. A device can have ony one identity..make another (sic)...." I did that, and found the bookmarks from "classic" profile, WHICH I'VE HAD ABOUT 20 YEARS, weren't imported. I uninstalled, reinstalled Firefox, managed to get the bookmarks back via a desktop folder I'd made, thank god! It didn't restore the 50 passwords, and still won't accept the previous password..which is another can of worms-it actually won't let me change my p/w w.o "you may lose your personal bookkmarks passwords etc!:" Even the 32 digit code (which I had saved) is not working...and it doesn't let you get another one unless you have a p/w!!!! Is this sounding a vicious circle....I am going to not use sync or another profile, b'c I'd rather keep my personal data (bookmarks) and rightnow, I was able to 'restore' to the original profile!!