Major bug kills buttons... Rated 1 out of 5 stars

Installing Xmarks deleted my buttons for all of my installed extensions. The developer has admitted there's a big problem but has not figured out how to correct it yet. So, AVOID this add-on 'til it's fixed. Plenty of other add-ons provide the same functionality without the headache, better to try one of those instead.

This review is for a previous version of the add-on (3.0.2).