One obligatory star Rated 1 out of 5 stars

I agree with all those who give this add-on one star only because it is required. Xmarks was an easy to use and reliable add-on when it was introduced for Firefox 3.x. It vanished because it couldn't be maintained and it re-appeared in this horribly unreliable version. One time it sync'd my bookmarks to oblivion and on another occasion scrambled completely scrambled them. At least the backup worked... So long, Xmarks.

This review is for a previous version of the add-on (4.2.1.1-signed).