Examine source code of Watch Together

{
  "name": "Watch Together",
  "version": "1.0",
  "manifest_version": 3,
  "description": "Synchronized video controlling using WebRTC.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{be7e9567-632c-47dc-bcb0-af29eda39f51}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "tabs"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "external/simplepeer.min.js",
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "32": "images/icon32.png",
      "64": "images/icon64.png",
      "128": "images/icon128.png"
    }
  },
  "icons": {
    "32": "images/icon32.png",
    "64": "images/icon64.png",
    "128": "images/icon128.png"
  }
}