Examine source code of Rtube Watch Party

{
  "manifest_version": 3,
  "name": "Rtube Watch Party",
  "version": "1.5.9",
  "description": "Synchronized video watching with friends. Support for YouTube, Rutube, and other video platforms.",
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "scripting",
    "alarms",
    "clipboardRead",
    "notifications"
  ],
  "host_permissions": [
    "*://*.youtube.com/*",
    "*://*.rutube.ru/*",
    "*://*.kinopoisk.ru/*",
    "*://*.ivi.ru/*",
    "*://*.okko.tv/*",
    "*://*.wink.ru/*",
    "*://*.netflix.com/*",
    "*://tv.apple.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "rtube-sync@watchparty.com",
      "strict_min_version": "109.0"
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*",
        "*://*.rutube.ru/*",
        "*://*.kinopoisk.ru/*",
        "*://*.ivi.ru/*",
        "*://*.okko.tv/*",
        "*://*.wink.ru/*",
        "*://*.netflix.com/*",
        "*://tv.apple.com/*"
      ],
      "all_frames": true,
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}