I'd love to pay $20 for a firefox extension that makes this problem go away. I use lots of privacy extensions on Firefox, and those Captchas are annoying as hell. Tor is even worse.
Just install Buster, it's free on the Mozilla Addon Site, you can set it to a STT provider other than Google, which I recommend since they seem to detect using their STT engine now.
You can pay for Azure and other STT engines to solve it for you an dthe results are usually a bit better.
Can you please provide a few ready-to-use links?