Examine source code of Stop Doom Scroll

{
  "manifest_version": 2,
  "name": "Stop Doom Scroll",
  "version": "1.3",
  "description": "Prevents scrolling in YouTube Shorts.",
  "icons": {
    "48": "icons/stopscroll-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "stop-doom-scroll@local",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "collects_personal_data": false,
        "collects_sensitive_data": false,
        "collects_location_data": false,
        "collects_web_activity_data": false
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "stopscroller.js"
      ],
      "run_at": "document_start"
    }
  ]
}