- Download the code, open FireFox.
- Create whatever edits you have or audit it, whatever.
- Save the file as a .zip and then rename the file extension to .xpi.
- Click Add-ons from the Tools menu and select the Extensions tab.
- Drag-and-drop the XPI file onto the page.
- Enjoy reading the news in style.
A chrome version of the same thing provided on the Chrome Web Store.
A bookmarklet also published on GitHub that serves the same purpose.