Examine source code of Rocky Island

{
  "name": "Rocky Island",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "2112.png"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(207, 103, 23, 0.25)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(255, 255, 255, 0)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(4, 184, 16, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{317b5d06-531a-4171-8a30-ae10544f7008}"
    }
  }
}