Examine source code of DeShort

{
  "manifest_version": 2,
  "name": "DeShort",
  "version": "1.0",
  "description": "Turn yt shorts to video in your browser",
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/shorts/*"
      ],
      "js": [
        "DeShort.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{af90761a-f081-42f0-ba0a-07490671d157}"
    }
  }
}