Examine source code of Premier League Theme V1

{
  "name": "Premier League Theme V1",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Premier-League-Theme.jpg"
    },
    "colors": {
      "frame": "rgba(57, 0, 60, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(255, 255, 255, 0.22)",
      "toolbar_field": "rgba(191, 207, 255, 0.68)",
      "toolbar_field_text": "rgba(57, 0, 60, 1)",
      "tab_line": "rgba(23, 0, 23, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c934d6ea-f013-4dce-9437-951e98994c97}"
    }
  }
}