I don’t think it’s browser specific or a direct targeting of Firefox; that’s likely confirmation bias. I see rolling captchas and the annoying ones that have a delayed fading in and out even on Chromium forks. I think the biggest reason for seeing them is VPN usage. When I turn off my VPN, I either don’t see any captchas or it just automatically shows the green check when I start them.
I never buy phones new anymore unless there’s a huge price drop or good deal involved. I’ll most likely pick up an refurbished or preowned 8 when the 9 and 9a come out, to save on costs. Assuming there’s nothing horribly wrong with the hardware, that is.