Rated 5 out of 5 stars

Finally, there is a replacement for gContactSync. Thank you very much !!

This review is for a previous version of the add-on (0.1.2). 

Thank you very much. It's still under development and will be partially rewritten in a few weeks when TbSync will be ported to the new WebExtension API. At the moment you'd better use it in read-only mode.