The Download Now link will prompt a local download of the Firefox extension. To install the extension directly, open the file using your Firefox browser.
extEMM adds a menu button to Firefox allowing the user to restart or close Firefox and re-open with the current tabs. The session is even saved through a reboot. This is a small extension that uses Firefox's internal session save features, light and fast. This version is the first release on CNET Download.com.
I really like the fact that I don't have to remember all sites, but can close down and go back to my work really quickly the next day.
Cons
It would be perfect if - like with explorer from windows - this option would always and automaticly happen when closing firefox. Now one has to be thoughtful of it when closing firefox, not via the x-button in the top right, but just below it on the EEM-button. But still a very nice application!