Examine source code of Streamlink Handoff

{
  "manifest_version": 3,
  "name": "Streamlink Handoff",
  "version": "2.0.5",
  "description": "Pass video URLs to Streamlink for playback",
  "icons": {
    "32": "icon.svg",
    "64": "icon.svg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "menus",
    "nativeMessaging",
    "storage",
    "clipboardWrite"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "streamlink-handoff@bgh.io"
    }
  },
  "options_ui": {
    "page": "options.html"
  }
}