Examine source code of Mozilla Classic

{
  "theme": {
    "images": {
      "theme_frame": "tbox-mozilla_classic.jpg"
    },
    "colors": {
      "frame": "#f5bb40",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Mozilla Classic",
  "manifest_version": 2
}