As it says in the question.
Its installed as a program.
Thanks for reply but I've tried that and friendschecker does not show up.
In order to uninstall a possibly unwanted extension, please do the following:
You can find further information about uninstalling extensions in the following articles:
Disable or remove Add-ons
Remove a toolbar that has taken over your Firefox search or home page
No add-on in my firefox browser but i actually FRIENDSCHECKERS