FireFound is hands down the best security add-on for Firefox. It is a recently launched add-on which can track the location of your laptop if lost or stolen. It shows you the approximate geolocation along with the WiFi Network it last connected to.
Once the add-on is installed, you will be asked to create a new account with FireFound(requires only username and password). When done, simply head over to the Options and choose to receive notification when the computer is used more than 2 miles(or any number of miles defined by the user) from it’s previous location.
It can delete all data if you activate the Emergency Data Protection mode from the FireFound Dashboard. You can select which data should be deleted from the Options, when this mode is activated.
Head over to the FireFound page and hit Login, enter the Username and Password and you will be shown the last known location along with the coordinates, IP address, city name, and WiFi network.
All information send or received is encrypted, so there is nothing to worry about the security. You can activate data protection from the main control panel which is located under the My Data tab.
Once you activate the data protection mode, the user who is using the browser will have to provide the password, if the password is wrong, the data which you selected to be deleted will be wiped out.
The only feature I would love to see is an option to backup the data before wiping it out. Having said that, I believe this add-on is a must for every user who prefer to protect his data. It can also track your mobile since it also works with Fennec(mobile Firefox).