title: How do I pop up a custom form/dialog in a Greasemonkey script?
body: <p>I have been working on a script to use as a plugin in Firefox, and have come across the need to pop up a custom form when a certain button is clicked. </p>
  
  <p>I need to be able to create the entire form myself and then parse the entered data to render images on the original site.</p>
  
  <p>How do I do this?</p>