Examine source code of Bookie NewTab

{
  "manifest_version": 2,
  "name": "Bookie NewTab",
  "version": "1.0.0",
  "description": "Minimal, stylish bookmark grid for LibreWolf's new tab.",
  "permissions": [
    "bookmarks",
    "storage"
  ],
  "icons": {
    "16": "img/icon_016.png",
    "48": "img/icon_048.png",
    "128": "img/icon_128.png"
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "bookie-newtab@local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}