Auto Add Signature Script ?

• Install Grease Monkey - Click Here.
  
• Download The Auto Add Signature Script ( Save Link As).
  
• Now open the script in notepad or any script editor and edit the value of "var signature" with your signature text.
  
• Save the Script and Install it.
  
• Open the tool box of Fire box ,there is a Grease Monkey Script Adder click on it and add the script from where you have Copied