Examine source code of TikTok Volumer

{
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "src/main.html"
  },
  "content_scripts": [
    {
      "js": [
        "src/volume.js"
      ],
      "matches": [
        "https://www.tiktok.com/*"
      ],
      "run_at": "document_start"
    }
  ],
  "description": "Easily manage and maintain a perfect volume level for TikTok Videos. Prevent your ears from being demolished.",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAih5Dx+7uKzB4yzZ2d8Z8i7xU14vr8EyAWYNHL1TW0WY5/q//BkP5xcP9lQR3BReWFvFVr6I3wQJuthWTt3qpXt7J0GVkheZB0QR0TtRPkio2G+vPrewXtoT1l/0nparm766CeGNPFQAJW6Mb68Yk4uNkeG3D00WTK7Q6YA4G6Hk3fYMd9I9/6kD1kUIiIbQpWw37Da9wCkLR9c3Rtu8TGWRgeCCa5+rcNl+yl7GIVbNU+5t3bxi8pAsbu13kkCHD36eCbLzaSTkB6Nvzadsfgx5kCr4PYY9v7+XYz8a7HFg9lmCK3kfGyCRI80+mUvg4OlCjMW9meO4VxVsvB8VC5wIDAQAB",
  "manifest_version": 2,
  "name": "TikTok Volume Buddy",
  "permissions": [
    "tabs",
    "storage"
  ],
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "2.0"
}