Examine source code of HackerForever

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "HackerForever",
  "manifest_version": 2,
  "description": "I made this theme for a great online game called HackerForever, and for all the HackerForever game lovers. \nI hope that Elmar Wenners will like this theme and all the other HackerForever lovers do as well. ENJOY"
}