Avaliado com 5 de 5 estrelas

por Utilizador do Firefox afa19a em Dez. 5, 2017 · ligação permanente

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