[jve]

I suspect Tor is being banned not because of a small user share.

Perhaps you may get broken sites with Firefox, because no-one cared. But banning? Seems like a stretch.

[kalleboo]

Tor is banned (or rather, tar-pitted in endless CAPTCHAs) because the amount of legit users is massively dwarfed by the abuse

If everyone running scrapers and attack probes start showing up as Firefox, then they'll end up in the same situation.

[oefrha]

If there are a lot of abuse masquerading as Firefox, outstripping legit users, they can totally throw up a CAPTCHA for Firefox but not for Chrome. An outright ban isn’t the only annoying outcome.