This is the experience with the `privacy.resistFingerprinting` flag set to true. A while back I made a few try to see how the behavior change with different settings and extensions, you can see the result here: https://github.com/google/recaptcha/issues/268#issuecomment-...

I solved the problem by using an extension that toggle that flag: https://addons.mozilla.org/en-US/firefox/addon/toggle-resist...