Auto login with Firefox?

Hi. In the course of my work I open several Firefox windows each with numerous tabs, all within the same website. The website requires a login, so for each tab I have to input a company name, username and password.

Firefox remembers my username and password, but not the company name; can anyone tell me of any way to automate login to this site? It's a small thing, but would save me loads of time.

Thanks.