Rated 1 out of 5 stars

I think mozilla is stubborn, you should develop it for 57. or for opera and chrome - vivaldi

This review is for a previous version of the add-on (1.29.2).  This user has a previous review of this add-on.

The problem is 57 is exactly the same as Chrome and Opera, therefore not possible make something like MP+ with pathetic WebExtension APi