Examine source code of a youtube-cleaner

{
  "manifest_version": 2,
  "name": "Youtube-cleaner",
  "version": "1.0",
  "description": "a simple extension that help to remove shorts and only_for_subscription videos",
  "icons": {
    "48": "icons/youtube-extension.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "main.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-cleaner@nothing.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}