Examine source code of PipedPlayer

{
  "manifest_version": 2,
  "name": "PipedPlayer",
  "version": "1.0.2",
  "description": "Redirects from Youtube to Piped",
  "icons": {
    "48": "icons/Piped-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "PipedPlayer@jacoblightning3"
    }
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/watch?v=*",
        "*://*.youtube.com/shorts/*"
      ],
      "js": [
        "PipedPlayer.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup/popup.html"
  }
}