Examine source code of Mytholia

{
  "theme": {
    "images": {
      "theme_frame": "firefox.jpg"
    },
    "colors": {
      "frame": "#decd11",
      "tab_background_text": "#f7780a"
    }
  },
  "version": "2.0",
  "name": "Mytholia",
  "manifest_version": 2,
  "description": "Strategy game"
}