Puntuado con 5 de 5 estrellas

por Firefox user 5cd16d el Nov. 14, 2017 ·

Please update this. :)

Esta valoración es de una versión anterior del complemento (5.10). 

de Oleksandr (desarrollador) el Nov. 14, 2017 ·

Unfortunately, WebExtensions (the new API for Firefox 57+) does not have the functionality for the correct operation of this addon in Firefox.

But you can install Firefox 52 ESR and enjoy work until June 2018
https://www.mozilla.org/en-US/firefox/organizations/faq/