This thing hasn't been updated in 3 years, since October 2019. Try this other addon instead that actually works

https://addons.mozilla.org/en-US/firefox/addon/ad-blocker-for-facebook-app/

or get the Chrome version instead:

https://chrome.google.com/webstore/detail/video-ad-blocker-for-face/cfelggdancjlfmekcfekjemffindioac

Junk, not working.

Doesn't work.

Does not work.Installed,restarted Ffx,rebooted system, nothing.

Pity, sponsored ads post are still visibles even after a force refresh (F5 or Ctrl+F5) and after a full restart. (Firefox 68.0 on a French Facebook webpage 15/07/2019)>. Still same 24/10/2022.