Rated 5 out of 5 stars

per Firefox user afa19a el des. 5, 2017 ·

Due to changes in the Firefox API, this add-on cannot be made compatible anymore for Firefox 57 and above. Best alternative is to reinstall Firefox 56 and to disable automatic updates.

https://www.wikihow.com/Downgrade-Firefox

This review is for a previous version of the add-on (0.8.1.13).