Examine source code of Grunge Fox

{
  "theme": {
    "images": {
      "theme_frame": "Grungyfoxhead.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Grunge Fox",
  "manifest_version": 2,
  "description": "It's a Fire Fox, and he's grungy. Doh!\n\nThis version is for monitors with resolution 1440x900 or higher. For lower resolution version, look for \"Grunge Fox Low-Res\""
}