BrowserID is designed to replace the login process on Web sites that requires users to supply an email and password. The experimental system relies on the Verified Email protocol and also works on other browsers, including Internet Explorer. Mozilla officials say that the system respects user privacy and does not leak any data back to the sites involved. The BrowserID project is in its early stages and will likely evolve over time, Mozilla said in its introduction of BrowserID. The system is implemented in HTTP and JavaScript on sites.
Source: https://threatpost.com/mozilla-releases-browserid-web-authentication-system-071511/75435/