Examine source code of Sparkle Background

{
  "name": "Sparkle Background",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Sparkle Background.png"
    },
    "colors": {
      "frame": "rgba(19, 19, 20, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{75ed0ff2-161e-4bef-a9b4-6fbe77f1bd00}"
    }
  }
}