My current views on Firefox adblocker addons
(The popup ads are only slightly irritating, but then YT started feeding me more and more long, unskippable ads. At that point it was either stop watching YT videos or do something about it.)
What makes a bunch of people twitchy about AdBlock Plus is that it's run by a company plus their business model of allowing some ads through. Although ABP is open source, this means that its development is subject to changes in business model and we've seen that cause problems before. Eventually various things made me uncomfortable and unhappy enough to switch to AdBlock Edge (also), which is a fork of ABP with a bunch of things removed. In my 'basically use the defaults' setup, AdBlock Edge works the same as AdBlock Plus. It certainly removes the YouTube ads, which is what I really care about right now.
(My honest opinion is that AdBlock Plus is probably not going to go bad, partly because a fair number of people are paying attention to it since it's a quite popular Firefox extension. Still, I feel a bit better with AdBlock Edge, perhaps because I've been burned by changing extension business models before.)
Recently µBlock has been in the information sources that I follow, so I gave it a try. Sadly, the results for me aren't positive in that µBlock did nothing to stop YouTube ads. Since this is the most important thing for me, I'm willing to forgive ABP and ABE a certain amount of resource consumption in order to get it. I do like the general µBlock pitch of being leaner and more efficient, so someday I hope it picks up this ability.
(As far as I know there's nothing else that blocks YouTube ads. I'd obviously be happy with a standalone extension for this plus µBlock for general blocking, but as far as I know no such thing exists.)