Examine source code of ju-youtube-syncer

{
  "manifest_version": 3,
  "name": "ju-youtube-syncer",
  "version": "0.0.6",
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "index.js"
      ]
    }
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_icon": {
      "38": "img/icon.png"
    },
    "default_title": "Open the Ju YouTube Syncer Menu",
    "default_popup": "popup/menu.html"
  },
  "host_permissions": [
    "https://www.youtube.com/*"
  ],
  "permissions": [
    "storage",
    "cookies",
    "webRequest",
    "webRequestBlocking"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{03a944c0-b2ec-4ba4-bced-34943c89de9b}"
    }
  }
}