An essential add-on
* Grand Prize Winner of Extend Firefox 3.5 **
FireFound is an add-on for Firefox and Fennec (mobile Firefox) that helps your find your computer (or mobile phone, in the case of Fennec) if it is lost or stolen. Every time your computer's location changes, FireFound sends a secure message to a central server with its current location. You can then log into the server and see your computer's current location.
All of the location data is encrypted, so no one can find out where your computer is without your password.
If you lose your computer, you can tell FireFound to clear your personal data (saved passwords, browsing history, etc.) if anyone starts your browser before you can retrieve it.
You can even run your own FireFound server; all of the code is open-source.
Note: All geolocation data is approximate, and should only be used as a guideline. If your computer has been stolen, do not try to retrieve it yourself - alert the police.