Examine source code of Sunset

{
  "name": "Sunset",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "[Bannière] sunset-wallpaper-3840x2160 .jpg"
    },
    "colors": {
      "frame": "rgba(42, 58, 89, 1)",
      "tab_background_text": "rgba(242, 238, 174, 1)",
      "toolbar": "rgba(140, 63, 91, 1)",
      "bookmark_text": "rgba(242, 238, 174, 1)",
      "toolbar_field": "rgba(191, 59, 83, 1)",
      "toolbar_field_text": "rgba(242, 238, 174, 1)",
      "tab_line": "rgba(242, 68, 100, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{39eee088-f2c2-4263-b105-c00262e4949c}"
    }
  }
}