Used for plenty of years on an assortment of different computers, but something within the last year has happened to the add-on that lets some of my custom filters slip through unblocked. I've fiddled with it so much that I've made the switch to uBlock Origin and have been having better results so far. Nothing wrong with my computer or Firefox, Ryzen 7 16GB RAM. Not really understanding the issue going on to be honest. Always down to re-download in the future if this issue gets fixed.

Amazing Addon for Ad Blocking

fixed: since last update i have to uncheck "ABP filters" or revert to second-last version for some site to work (fmovies.to player doesn't load)

This is the most reliable, trustworthy ad blocker available. I like that ABP gives you the option to allow "acceptable advertising", so that advertisers are encouraged to try to make their ads less annoying instead of finding new ways to circumvent ad blockers. Hopefully, that will stop the "arms race" between advertisers and ad blockers.

The only machines that I don't run ABP on are old ones with very little RAM. If you are running low on RAM, I'd recommend checking out uBlockOrigin, which is also good.