You will need to install a user script manager extension to install this script.
This will count the accepts you make and alert you when you're getting close to a captcha. It also puts a count of hits remaining until captcha near the clock on hits. NOTE: It is literally impossible for this to work with things like Turkmaster because of the way it works. Also, this doesn't work if you're pandaing a hit in another browser, and does not cross browsers. IE it'll only work in your current session.