Examine source code of YTM Mini Mode

{
  "manifest_version": 3,
  "name": "YTM Mini Mode",
  "version": "1.3",
  "description": "Adds a Mini Player mode to YouTube Music for multitasking.",
  "author": "Kanak Waradkar",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "tabs"
  ],
  "host_permissions": [
    "*://music.youtube.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "browser-polyfill.min.js",
        "content.js"
      ],
      "matches": [
        "*://music.youtube.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "kakeroth222@gmail.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "icons/icon-48.png"
      ],
      "matches": [
        "*://music.youtube.com/*"
      ]
    }
  ]
}