Try changing DNS over HTTPS (DoH) to "Off" or "Max Protection" and in Connection Settings change "Use system proxy settings" to "No proxy".

Does it still happen in Troubleshoot Mode?

This is something Google needs to fix.

from /questions/1446411 thread example.

Only Firefox with a Windows user agent seems to be affected. It works for me with a MAC user agent and with a Linux user agent. You can use a User-Agent Switcher extension and set the user agent to Chrome or Edge on Windows 11 until this is fixed.

• https://addons.mozilla.org/firefox/addon/user-agent-string-switcher/
• /questions/1446332 Recaptcha Not Working in Firefox Specifically

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You can check the progress here:

• 1894735 - reCAPTCHA shows a high failure rate and occasionally endless blocks

(please do not comment in bug reports
https://bugzilla.mozilla.org/page.cgi?id=etiquette.html)

It appears that Google has fixed this recaptcha issue for Windows Firefox users. You can change Firefox useragent back to the default if you did the temporary workaround by changing it with a useragant extension or by preference in about:config