[evgpbfhnr]

or just that they don't run windows/mac OS with chome like everyone else and it's "suspicious". I get cloudflare capchas all the time with firefox on linux... (and I'm pretty sure there's no such app in my home network!)

[Doxin]

FWIW I run firefox on linux too, and I don't have any trouble with cloudflare captchas. I get them every now and then but definitely not all the time.