Many Firefox web browser users have run into the infamous Google captcha challenge. No matter how much patience the user has, passing the test for being a human likely will take a dozen or more attempts.
The primary cause of the problem is enabling
resistFingerprinting and ad blocking tools. Not to ignore the speculation that through the bane of the web the captcha might be a portal for reading the user’s browser’s history, bookmarks, or mouse cursor movement.
All of which are good clues the captchas are not about distinguishing humans from bots but data mining and tracking.