Examine source code of Watch Party

{
  "name": "Watch Party",
  "short_name": "WP",
  "version": "1.7.17",
  "description": "Watch streamed content together.",
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "https://*.hulu.com/*",
    "https://*.netflix.com/*",
    "https://*.amazon.com/*",
    "https://*.amazon.com.au/*",
    "https://*.amazon.com.br/*",
    "https://*.amazon.ca/*",
    "https://*.amazon.cn/*",
    "https://*.amazon.de/*",
    "https://*.amazon.fr/*",
    "https://*.amazon.in/*",
    "https://*.amazon.it/*",
    "https://*.amazon.co.jp/*",
    "https://*.amazon.com.mx/*",
    "https://*.amazon.nl/*",
    "https://*.amazon.sa/*",
    "https://*.amazon.sg/*",
    "https://*.amazon.es/*",
    "https://*.amazon.com.tr/*",
    "https://*.amazon.ae/*",
    "https://*.amazon.co.uk/*",
    "https://*.primevideo.com/*",
    "https://*.disneyplus.com/*",
    "https://*.youtube.com/*",
    "https://play.hbonow.com/*",
    "https://play.hbomax.com/*",
    "https://*.peacocktv.com/*",
    "https://play.google.com/movies/*",
    "https://*.crunchyroll.com/*",
    "https://tv.apple.com/*",
    "https://*.viki.com/*",
    "https://*.funimation.com/*",
    "https://*.roosterteeth.com/*",
    "https://*.stan.com.au/*",
    "https://*.hotstar.com/*",
    "https://*.airtelxstream.in/*",
    "https://*.vimeo.com/*",
    "https://*.dailymotion.com/*",
    "https://*.imdb.com/tv/*",
    "https://*.paramountplus.com/*",
    "https://*.starz.com/*",
    "https://api.giphy.com/*",
    "https://*.voxeet.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.hulu.com/*",
        "https://*.netflix.com/*",
        "https://*.amazon.com/*",
        "https://*.amazon.com.au/*",
        "https://*.amazon.com.br/*",
        "https://*.amazon.ca/*",
        "https://*.amazon.cn/*",
        "https://*.amazon.de/*",
        "https://*.amazon.fr/*",
        "https://*.amazon.in/*",
        "https://*.amazon.it/*",
        "https://*.amazon.co.jp/*",
        "https://*.amazon.com.mx/*",
        "https://*.amazon.nl/*",
        "https://*.amazon.sa/*",
        "https://*.amazon.sg/*",
        "https://*.amazon.es/*",
        "https://*.amazon.com.tr/*",
        "https://*.amazon.ae/*",
        "https://*.amazon.co.uk/*",
        "https://*.primevideo.com/*",
        "https://*.disneyplus.com/*",
        "https://*.youtube.com/*",
        "https://play.hbonow.com/*",
        "https://play.hbomax.com/*",
        "https://*.peacocktv.com/*",
        "https://play.google.com/*",
        "https://*.crunchyroll.com/*",
        "https://tv.apple.com/*",
        "https://*.viki.com/*",
        "https://*.funimation.com/*",
        "https://*.roosterteeth.com/*",
        "https://*.stan.com.au/*",
        "https://*.hotstar.com/*",
        "https://*.airtelxstream.in/*",
        "https://*.vimeo.com/*",
        "https://*.dailymotion.com/*",
        "https://*.imdb.com/tv/*",
        "https://*.paramountplus.com/*",
        "https://*.starz.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "/static/js/content.js"
      ],
      "css": [
        "/static/css/app.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "/*.png",
    "static/media/*.svg"
  ],
  "icons": {
    "16": "wp16.png",
    "32": "wp32.png",
    "96": "wp96.png",
    "128": "wp128.png",
    "144": "wp144.png",
    "192": "wp192.png"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{155c08c1-4274-426c-b08d-fca4d2b2d38d}"
    }
  }
}