It takes over the default manager of Firefox as soon as it is installed. Sxipper is smarter because remembering password for you, it auto trains itself to remember user names and other fields you normally see in registration forms over web, like address, website, email address, postal code, etc.
Sxipper detects the all the user names of a particular site, and shows you a list of all those names when you visit that site.
But the best feature of Sxipper is that it helps you login a site in just ONE-CLICK!
If you check the small "Auto submit" checkbox below the username field. You just have to choose your username from the list (if your password is already saved offcourse) and click it - it logs you in automatically so you don't have to press a single from keyboard to enter anything.
