Really? I use Firefox literally all the time (with the minor exception of some internal work sites where they require Edge) and while all captchas annoy me to no end, recaptcha does work perfectly fine on Firefox even with uBlock origin and pihole running. Both on Desktop (I use FF on Windows, Mac, Linux and FreeBSD :) ) and on Android.

What is the problem you're seeing?

In fact I really rarely have any issues with FF whatsoever, and if I do it is always either uBlock Origin blocking a little bit too much, or a site that specifically rules out Firefox (like https://business.apple.com ), probably for no real reason other than not bothering to test their site with it.