uBlock Origin is what makes Firefox even greater and definitely one big reason I use Firefox over Chrome etc. It make the Internet browsable.
Plus I personally consider ads a cancer of modern society. White and not so white lies, manipulation... nothing respectable regardless (or because ) of tremendous money circulating in it.
secushare[1] makes the case that this is because the internet lacks a secure micropayments layer, so the funding model for everything has to be advertising-based instead of patronage-based. Paypal and the like are exploited as cash cows because of their centralized nature. Cryptocurrencies were later tried but have technical limitations that broadly prohibit this use case (even with payment channels/LN).
Even in torrents you have private trackers and all of these annoying incentive systems for people to host content. If you had a good reward system on top of bittorrent/IPFS I think that idea could take over the world, but it is not efficient or decentralized to do so.
1) Google-owned sites seem to just chew CPU on Firefox. In particular I'm thinking of GMail and Youtube, both of which I'm a heavy user of, and also Maps. But no non-google sites seem to have this problem.
2) I'm constantly getting websites saying "This is your first time using this device, are you sure you're you?", and I haven't tried whether it's better on Chrome, but it's pretty crazy because I've literally never used your stupid site with any other device, and I used it with THIS device just last month you idiots. I'm just blind guessing that this is some kind of problem as a result of Firefox privacy choices, like maybe the site doesn't know how to use cookies in a way that doesn't trigger anti-tracking. For example banks.
But Firefox can keep thousands of tabs open at once (thousands. plural. not kidding, not exaggerating.), it has working uBO, and the frequency of "just because we wanted to" UX changes is much lower. It's just a better choice all around.