Examine source code of AJ

{
  "name": "AJ",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Birthday Cake 18-03-2007.jpg"
    },
    "colors": {
      "frame": "rgba(143, 145, 148, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(245, 245, 245, 0.44)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(247, 247, 247, 0.97)",
      "toolbar_field_text": "rgba(20, 19, 19, 0.94)",
      "tab_line": "rgba(18, 18, 20, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{02524a11-747a-4fa8-a052-8b9845be0819}"
    }
  }
}