I actually did that for a while (on my PC at least). Major pain in the ass unfortunately.
Of course it’s good to block that crap, but usability takes too much of a nose dive. I do live in the EU though, so when it comes to data protection things have gotten a lot better in the last years.
What is actually your problem with Android FF? I use it every day on my phone.
Yes, it’s not as snappy as Chrome, but besides that everything works perfectly. In addition to that: Fully fledged ad-blocker like on desktop, one big reason why I no longer use Chrome on my phone.