Really nice stuff!
NB: the recent extension issues is not related specifically to this one, please read https://discourse.mozilla.org/t/certificate-issue-causing-add-ons-to-be-disabled-or-fail-to-install/39047

excelente solução para block anúncios indesejados

very effective and thorough

This add-on was great, until Firefox updated itself and gave me an error that this add-on (uBlock Origin) is no longer supported. Switching back to the older version (66.02) of Firefox did not help. Not the developer's fault, but it is definitely Mozilla's fault