Rated 5 out of 5 stars

the new Version Final is on air, please update my friend!
thank you very much!

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

Mozilla guys are still reviewing new version of the add-on thus it is not available in common ways.

You may try to install it directly from AMO:
(Or use the link from Developer's comments, it could be more usable. )