Examine source code of YouTube Picture in Picture

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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "__MSG_appName__",
  "description": "__MSG_shortDesc__",
  "homepage_url": "https://chrome-page.com/youtube-picture-in-picture",
  "default_locale": "en",
  "version": "1.0.1",
  "manifest_version": 3,
  "permissions": [
    "storage",
    "scripting",
    "activeTab"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "background": {
    "service_worker": "worker.js"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "css": [
        "data/plugins/youtube.css"
      ],
      "js": [
        "data/plugins/youtube.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "data/plugins/global.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "action": {
    "default_title": "Click to PiP",
    "default_icon": {
      "16": "data/icons/disabled/16.png",
      "32": "data/icons/disabled/32.png",
      "48": "data/icons/disabled/48.png"
    }
  },
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png"
  },
  "commands": {
    "_execute_action": {}
  }
}