Hello Eugene. First of all, and although possibly not related to your problem, I will remind you that the version of Firefox you are using at the moment as been discontinued and is no longer supported. Furthermore, it has known bugs and security problems. I urge you to update to the latest version of Firefox, for maximum stability, performance, security and usability. You can get it for free, as always, at [http://www.getfirefox.com www.getfirefox.com]. As for your problem, try reading this article to see if it contains the info you need: https://support.mozilla.com/en-US/kb/Form+autocomplete

See also http://www.google.com/support/toolbar/bin/answer.py?hl=en&answer=47972 - AutoFill : Web-browsing tools - Toolbar Help