I recently had to re-install firefox and chrome. I then re-installed xmarks in both browsers. Now xmarks crashes firefox on sync.
I'm running Windows 7 (up to date to the day) Firefox 30.0 Xmarks 4.3.3
I've tried many types of remove xmarks, reinstall xmarks, reset all about:config settings, remove all xmarks related files from profile. Etc. In other words, I've tried to make my install as clean as possible, but no dice.