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It isn't enabled by default so users still have to turn it on at this point. AdBlock was the highest voted feature that users wanted and was the biggest feature I could include that Chrome could not. From a bang for my time/effort AdBlock was a winner.
Hallelujah! Thank you for making that leap. I'm no longer as fond of Firefox as I once was. It has persistent memory issues, and is getting more and more bloaty. But, it's also got AB+, and that for a lot of people is a killer feature. I think there are a bunch of sound counter-arguments to the people saying that AB+ will kill their websites: one, users are sick of websites with more advertising-related content than…
There are perfectly good reasons to block ads, but far too many people take a brute force approach to it that will result in good sites going away, or charging users instead of advertisers. I think both of those outcomes suck. If you want to block ads, I'm sure you can spare 30 seconds to let people know why and how to get you to stop.