Once I had to use the internet without and ad blocker ( shiver ). It was horrible. I still have nightmares.
Joking aside. I couldn’t believe how crammed full and chaotic sites were without an ad blocker. I have no evidence to support this other than my experience but I think , for me , ad blockers are good for my mental health. Being constantly exposed to all those messages trying to exploit insecurities can’t be good for people.
Anyways ad blockers are the best.
I like theming , I am already a Firefox user. I think the sad reality is that for more adoptions , in the order of numbers that chrome puts up , Firefox needs to be a default application ; the common users doesn't want to customize anything ( my hot take ).
I don't think it is important that Firefox gets to those numbers as long as they can generate enough revenue to keep going.