Browser's do have the option to save username's and password's but they are not pass worded or encrypted. So you risk allowing a hacker or a stranger accessing your computer to log into your saved sites, email's, paypal etc.
With easy pass it is an independent program with an encrypted and contained database of all your sites, applications username and passwords. But easypass doesn't user contain logins it contains Note's , bank details that really come in handy when you are a heavy internet or computer user.
Another advantage of easypass is that it encrypts and syncs the data to a server so should you own more than one computer you can sync between all without having to mess around re-entering all the details. It also means if you loose a computer your data is safe and secure ready for you to install and sync to a replacement system.