This looks great! It would make for a natural fit with tab groups, unfortunately Mozilla has removed that feature, and the extension will not be updated [0] to

This looks great! It would make for a natural fit with tab groups, unfortunately Mozilla has removed that feature, and the extension will not be updated [0] to support the new extension API at the end of this year. [0] http://fasezero.com/lastnotice.html http://fasezero.com/lastnotice.html