In terms of single sign-in, BrowserID is more advanced, but also more complex. The single sign-in in Browsr does not require any email address. You simply need

In terms of single sign-in, BrowserID is more advanced, but also more complex. The single sign-in in Browsr does not require any email address. You simply need a username and a password. And while third-parties can implement Browsr for a seamless sign in experience, they don't HAVE to. Users can save username/passwords for each of their services and Browsr logs them in automatically, making it useful from the get go.