Examine source code of Mozilla Old School

{
  "theme": {
    "images": {
      "theme_frame": "mozilla_theme_A.jpg"
    },
    "colors": {
      "frame": "#808080",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Mozilla Old School",
  "manifest_version": 2,
  "description": "Old School Mozilla is back. Original Images from the early days of Netscape celebrating the first mascot of the internet."
}