Firefox Type-Helper?

Hi, I need some help... I have noticed on Mozilla Firefox (v 1.0.6) that sometimes a problem arises where a type-helper somehow opens, and messes up typing of general things, such as emails, messages, and passwords. It seems to spontaniously begin, and there are no settings that I have seen that will stop it... it seems like it's here to stay... is there any way I can stop it without (1) destabilizing the program, or (2) deleting files (this computer isn't just for me)