I tried this to block some of the numerous YouTube ads. It worked at first but after closing the Donate page and trying it further it really negatively impacted FireFox performance. YouTube would buffer where it never did before AdBlocker Ultimate was installed. The YouTube audio would just stop playing midway. I rebooted my PC multiple times, cleared Firefox browswer cache. Finally I just uninstalled AdBlocker Ultimate and all my problems went away except for the YouTube ads. It's not just YouTube that was impacted negatively by AdBlocker, other sites would time out or just stop working. Removing AdBlocker solved the problems.

YouTube is injecting so many ads now it's getting irritating like the old popup browser ads we had in the early 2000's. I guess they want to irritate viewers to pay $9.99 a month but everyone wants $10-$15 month for content, Netflix, Hulu, YouTube, CBS, Disney, ESPN, Amazon...etc. I already pay for 3 services pr/mo + Internet.

Anyway, AdBlocker Ultimate really bogged FireFox down and who knows what information it collected along the way. Not recommened.