uBlock Origin and other content blocker extensions have 10+ Million users each on Chrome, it'll be interesting to see what happens when they eventually to cease to function (June 2023). How will users react?
Hopefully, Mozilla won't be completely inept as to fail to position themselves to capture any users leaving Chrome over this.
10 million people is pretty damn tiny when compared to the 4 and some billion internet users out there, though. Even if 100% of them moved over, isn't it just fractions of a percentage point? Why would Google care at all?
10+ million was the number I gave because it's what the Chrome store reports, unfortunately for all extensions it doesn't report a number larger than that. I don't think it's possible to get an accurate number, it could be quite a bit larger.
I've seen some suggestions that the number of adblock users could be as high as 40% of all users but that's possibly an over estimation. It's also not clear how they are collecting that information.
Hopefully, Mozilla won't be completely inept as to fail to position themselves to capture any users leaving Chrome over this.