Examine source code of A Silent Night by MaDonna

{
  "name": "A Silent Night by MaDonna",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "SilentNightH1.jpg"
    },
    "colors": {
      "frame": "rgba(50, 51, 42, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(50, 51, 42, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(76, 77, 71, 0.06)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5a70c9b1-c445-4941-901e-080a75192a80}"
    }
  }
}