Examine source code of Picture in Picture for TikTok, Reels & YouTube

{
  "update_url" : "https://clients2.google.com/service/update2/crx" ,
  "manifest_version" : 3 ,
  "name" : "Picture in Picture for TikTok, Reels & YouTube",
  "version" : "0.2.0",
  "description" : "Picture-in-Picture for TikTok, Facebook Reels and YouTube, with feed navigation and 10-second seek.",
  "permissions" : [
    "activeTab" ,
    "scripting" 
  ],
  "background" : {
    "service_worker" : "background.js" 
  },
  "action" : {
    "default_title" : "Toggle Picture-in-Picture",
    "default_icon" : {
      "16" : "assets/icon-16.png",
      "32" : "assets/icon-32.png",
      "48" : "assets/icon-48.png",
      "128" : "assets/icon-128.png"
    }
  },
  "icons" : {
    "16" : "assets/icon-16.png",
    "32" : "assets/icon-32.png",
    "48" : "assets/icon-48.png",
    "128" : "assets/icon-128.png"
  },
  "content_scripts" : [
    {
      "matches" : [
        "*://*.youtube.com/*" ,
        "*://youtube.com/*" ,
        "*://*.tiktok.com/*" ,
        "*://tiktok.com/*" ,
        "*://*.facebook.com/*" ,
        "*://facebook.com/*" ,
        "*://*.fb.watch/*" ,
        "*://fb.watch/*" 
      ],
      "js" : [
        "content.js" 
      ],
      "run_at" : "document_idle" 
    }
  ],
  "commands" : {
    "toggle-pip": {
      "suggested_key": {
        "default": "Alt+P",
        "mac": "Alt+P"
      },
      "description" : "Mở hoặc đóng Picture-in-Picture"
    },
    "seek-back": {
      "description" : "Seek back 10 seconds"
    },
    "seek-forward": {
      "description" : "Seek forward 10 seconds"
    },
    "toggle-mute": {
      "suggested_key": {
        "default": "Alt+M",
        "mac": "Alt+M"
      },
      "description" : "Mute or unmute video"
    },
    "previous-video": {
      "description" : "Previous video or Reel"
    },
    "next-video": {
      "description" : "Next video or Reel"
    }
  }
}