Examine source code of Counter Strike

{
  "theme": {
    "images": {
      "theme_frame": "temafirefox.jpg"
    },
    "colors": {
      "frame": "#f2eaea",
      "tab_background_text": "#f5f0f0"
    }
  },
  "version": "2.0",
  "name": "Counter Strike",
  "manifest_version": 2,
  "description": "persona para firefox"
}