Captcha solving plug-in for firefox?

Ideally it would be one that can use the APIs of the various captcha solving services. But so far i haven't found one, except captchamonster, which is way too expensive (0.05 per captcha)
Maybe someone of you have seen something that can do that?

Maybe try imacros to this. Search google for macros or do them yourself.

imacros can't do that obviosly...