Rated 5 out of 5 stars

by U.C. on Nov. 15, 2017 ·

SOLUTION FOR FIREFOX 57+
Install a second version of Firefox (v.56) and deactivate the update.
Here you can find all versions:
https://ftp.mozilla.org/pub/firefox/releases/

This review is for a previous version of the add-on (5.2.0).  This user has 2 previous reviews of this add-on.