Userscripts.org

When I tried to login to gmail, it failed because apparently my remembered
password was incorrect. Because you end up at the same page (with the password
filled in), the script retries to login. And because it is so fast, you can barely change
the password. This goes on and eventually gmail will add a reCaptcha field, further
avoiding this script to work.

Maybe a check for a successful or failed login could be added?
Some sites redirect you to a special page and others print an error message.
Maybe a check for that error message could be implemented?