5 people in my family each with multiple devices. To get them all to use FireFox which isn't even actual FireFox on iPhone/iPad, ditch the native apps, install specific extensions, figure out how to get it onto their TVs, how to get YouTube music to work in CarPlay with an ad blocker, probably other things I'm not thinking of... would be much more effort than paying.
I don't have the time and energy for that.