Examine source code of YouTube UI Cleaner

{
  "manifest_version": 3,
  "name": "YouTube UI Cleaner",
  "version": "2.0",
  "description": "Hide Shorts, Grouped Videos, Live Streams, Paid Promos, and use Custom Keyword Filters for a cleaner YouTube experience.",
  "permissions": [
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "*://*.youtube.com/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon.png",
      "48": "icon.png",
      "128": "icon.png"
    }
  },
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@youtube-ui-cleaner",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}