If you're having trouble proving you're not a robot with a reCAPTCHA prompt not working, worry not. There are a few things you can try to get it functioning.

Google has rolled back a recent release of its reCaptcha captcha script after a bug caused the service to no longer work on Firefox for Windows.

However, the reCAPTCHA API that supports the ReCAPTCHA checkbox is still working in the background. It allows Google to collect and analyze information about devices and apps.