title: UserScript: run JavaScript on password fields as they're loaded
body: <p>I want to write a user script that runs some custom JavaScript code on each <code>&lt;input type="password"&gt;</code> field that gets loaded. I could register an event handler on document load to look for all input fields and run the JavaScript code on them, but that means firstly that the JavaScript code won't run on input fields that subsequently get added by other JavaScript code, and secondly it won't run until the page is fully loaded.</p>
  
  <p>I want to put <a href="http://mattt.github.com/Chroma-Hash" rel="nofollow noreferrer">ChromaHash</a> into all of my password fields.</p>