title: Can I embed html code into a website using page-mod, in a firefox extension?
body: <p>Could you point me towards an example of using page-mod so every time a user enters a website like example.com, alongside the actual content of the page, there would be also some other elements such as a javascript widget?
  I'm using the add-on builder for my extension so the page-mod module seems the logical way to solve this.
  Thanks a lot</p>