HN user
because Buster doesn't work on it
Assuming you mean Debian Buster: Then get a newer Firefox version from backports. This is more related to Firefox ESR than Buster.
Edit: Nevermind... After reading other replies, I think eznzt referred to https://github.com/dessant/buster
But also far superior to reCaptcha from a bot's perspective using Tor. Don't get me wrong: I also hate solving a gazillion captchas only because I'm using a VPN or get outright denied because my IP address happens to be a Tor exit node. At the same time you have to acknoledge that captchas don't stop bots, only slow them down or increase their operating costs. People in third world countries happily solve one image recognition challenge by Google or hCaptcha for far less than a penny. If Google's goal is to drive the costs up for malicious bot operators, then they're definitely doing the right thing. In the end, it won't stop them either since buying a couple thousand infected computers is probably not that expensive, but it is yet another stepping stone for anyone trying to bypass their captcha.
BotStop by hCaptcha (enterprise). AFAIK there's also a Google reCaptcha frontend that doesn't require JS. Neither companies offer those solutions because of privacy or security benefits, but to support old IE versions of course.