firefox went to blubber. No more going back nor forth, no more bookmarks, ..
I went about trying to find the culprit amongst the settings files, but no not much avail. In the end, the shotgun approach helped though it cost me all my saved passwords. Frack!
I’d already realised I’ve lost my bookmarks (no loss) .. I guess I should be happy I wont have to reinstall the plugins 
blog.cone 