Only Firefox with a Windows user agent seems to be affected by this issue with reCAPTCHA not working. 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.

• https://addons.mozilla.org/firefox/addon/user-agent-string-switcher/
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:125.0) AppleWebKit Gecko/20100101 Firefox/125.0

This has been reported to Google, so wait until Google fixes this and then undo this temporary fix.

I found and installed that extension last night. Nothing changed. Supposedly when activated its icon appears in the toolbar. Well, it does not. I deleted it last night.

 This morning I read your reply and tried again.  Same result.  Nothing.  I have no way to use that extension, so can do nothing.  I have watched 2 videos and they show an icon in the upper right hand corner that gets the extension working.  I do not have that icon.  
 I am still locked out of all sites that use captcha.

This should have been fixed by Google.

• https://bugzilla.mozilla.org/show_bug.cgi?id=1894735#c23

You can try these steps in case of issues with webpages:

You can reload webpage(s) and bypass the cache to refresh possibly outdated or corrupted files.

• hold down the Shift key and left-click the Reload button
• press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• press "Command + Shift + R" (Mac)

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings), click the padlock icon (Clear cookies and site data) for the domain in the selected tab.

"Remove the Cookies" for websites that cause problems:

• Settings -> Privacy & Security
  Cookies and Site Data: "Manage Data"

"Clear the Cache":

• Settings -> Privacy & Security
  Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear

• https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox
• https://support.mozilla.org/en-US/kb/how-clear-firefox-cache

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.

• switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
• do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window

• https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

You can check for issues with Enhanced Tracking Protection. Firefox shows a purple shield instead of a gray shield at the left end of the location/address bar in case Enhanced Tracking Protection is blocking content.

• click the shield icon for more detail and possibly disable the protection

You can check the Web Console for relevant-looking messages like blocked content.

• https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop
• https://support.mozilla.org/en-US/kb/total-cookie-protection-and-website-breakage-faq
• https://support.mozilla.org/en-US/kb/trackers-and-scripts-firefox-blocks-enhanced-track

I replied first thing this morning, then tried Firefox again and today captcha is working again. Thank you for the replies.