Automatically inserts HTML signatures into your Gmail messages based on which address you are sending from.

Automatically inserts a signature into Gmail messages containing current listening information for a specified Last.fm user.

This lets you (finally) disable users' signatures and avatars on Maxconsole's forums. Also kills the "Maxdeals" divineo ads on the main page. Now all 3 options (avatar killing, signature killing, ad killing) can be toggled in "User Script Commands".