title: Is it easy to develop a simple Firefox plugin (JS injection)
body: <p>So I was just wondering if it was easy to develop a very simple Firefox plugin where you could click a button, and it would execute some Javascript code!</p>
  
  <p>Please note that I have never developed any kind of plugin for firefox, I just want to know if that is an easy task to do (like less than an hour)</p>
  
  <p>I would also like to redistribute this very simple plugin to my friends.</p>