I installed the extension in FF. All I got was a blank window where my bookmarks would presumably show, saying "Folder is Empty". I saw no help or info showing me how to set up auto sync with other browsers on my Mac or PC. Luckily I stumbled upon some brief info by clicking on the tool bar icon (I normally hide those). It just said 'initializing' in an infinite loop. NOT A USER FRIENDLY EXTENSION.

not working in latest FF

Not working on the latest FF release???