Examine source code of Music Widget

{
  "manifest_version": 2,
  "name": "Music Widget",
  "version": "1.0.2",
  "description": "Display your currently playing Spotify song on your stream overlay. Works with StreamElements custom widgets.",
  "permissions": [
    "storage",
    "https://open.spotify.com/*",
    "https://widget.greatvtubers.com/*",
    "https://streamelements.com/*",
    "https://cdn.streamelements.com/*"
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://open.spotify.com/*"
      ],
      "js": [
        "content-scripts/spotify-observer.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://streamelements.com/overlay/*",
        "https://streamelements.com/dashboard/overlays/*"
      ],
      "js": [
        "content-scripts/streamelements-loader.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    "content-scripts/streamelements-injector.js",
    "lib/jszip.min.js"
  ],
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "music-widget@greatartstudio.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}