I'm using Android Firefox v 54.0. The first time I installed it a month ago I ran sync and to my surprise it did sync all my bookmarks, which are probably well over 5,000. However since then, when I try to sync again it doesn't sync any recent bookmarks. How can I delete all the bookmarks on Android and try it from scratch again? Btw, I have to say, the entire Bookmarks section on Android is a shadow of the functionality of the Bookmarks on desktop. Cannot organize , cannot sort, no "description", no keywords.