Looks good, but cant use Rated 3 out of 5 stars

I'm going to reserve my rating until I figure out why, but every time I try to use this extension, it causes my bookmarks toolbar to go blank, along with my toolbar icons for other extensions. I don't know if it's conflicting with an existing extension that I have, or if it's this one, but I just cant seem to get it to work correctly.

This review is for a previous version of the add-on (0.7).