This implements the experimental
Sessions API being developed at Mozilla Labs.
The purpose of this plugin is to work with the
Browser Sign In Firefox Add-on -
GitHub. The Browser Sign In plugin looks for navigator.id.sessions. If set to
[], the site signifies that it supports Sign In and Sign Out from within the browser. If set to
[ {email: <username>} ], that user's name will be displayed in the URL bar.
More information about Browser Sign In can be found at
Mozilla's Identity Site and
Shane's Tutorial
If you see any problems with this code, please contact me!