title: Automatically run JavaScript code upon loading a specific website
body: <p>I've written scripts to filter out threads and posts in a programming forum by author.  </p>
  
  <p>But you need to post the code into the web console for each page individually.</p>
  
  <p>I was wondering if it were possible and if so how (using either firefox or chrome), to set your browser up to run a specific script upon loading a specific site? Is it possible as an extension or plugin?</p>