Examine source code of Hide_Youtube_Shorts

{
  "manifest_version": 2,
  "name": "Hide_Youtube_Shorts",
  "version": "1.0",
  "description": "Hide Youtube Shorts from subscriptions.",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "hide_youtube_shorts.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2552722a-a341-46fd-b45b-aa04e1c4d701}"
    }
  }
}