Examine source code of Garth Squair

{
  "theme": {
    "images": {
      "theme_frame": "Defiance_by_G0069copy.jpg"
    },
    "colors": {
      "frame": "#608562",
      "tab_background_text": "#870b0b"
    }
  },
  "version": "2.0",
  "name": "Garth Squair",
  "manifest_version": 2,
  "description": "Garth Squair, or G0069. ;) The greatest man in the world can now be on your firefox window! :D"
}