Examine source code of Final Fantasy 4

{
  "theme": {
    "images": {
      "theme_frame": "Firefoxtheme.png"
    },
    "colors": {
      "frame": "#1a0c4a",
      "tab_background_text": "#030303"
    }
  },
  "version": "2.0",
  "name": "Final Fantasy 4",
  "manifest_version": 2,
  "description": "Final Fantasy"
}