Examine source code of YouTube Miniplayer

{
  "manifest_version": 3,
  "name": "YouTube Miniplayer",
  "short_name": "YT Miniplayer",
  "version": "1.1",
  "description": "Opens YouTube links in a draggable, resizable miniplayer on any website. Supports Shorts, playlists, multiple players, PiP pop-out and more.",
  "browser_specific_settings": {
    "gecko": {
      "id": "bukhariahmed76@gmail.com",
      "strict_min_version": "126.0"
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "webNavigation"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "action": {
    "default_icon": {
      "19": "icon48.png",
      "38": "icon128.png"
    },
    "default_title": "YouTube Miniplayer",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "options_page": "options.html",
  "commands": {
    "close-player": {
      "suggested_key": {
        "default": "Alt+W"
      },
      "description": "Close the active miniplayer"
    },
    "toggle-extension": {
      "suggested_key": {
        "default": "Alt+Y"
      },
      "description": "Toggle the miniplayer on/off"
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "default_locale": "en"
}