Examine source code of Matrix Code Animated

{
  "theme": {
    "images": {
      "theme_frame": "headeranimsmall.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#33cc00"
    }
  },
  "version": "2.0",
  "name": "Matrix Code Animated",
  "manifest_version": 2,
  "description": "Simple matrix code animation for your browser\n[The animation would be a lot smoother were it not for the 300K size limit :( ]"
}