Examine source code of DelShorts

{
  "manifest_version": 2,
  "name": "DelShorts",
  "version": "1.0",
  "description": "Removes shorts from youtubes",
  "icons": {
    "64": "icons/delshorts64.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "delshorts.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{200c49c6-e19e-4122-8e7d-e1d07656dbe1}"
    }
  }
}