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.