Examine source code of HideLM

{
  "manifest_version": 3,
  "name": "HideLM",
  "version": "1.2.6",
  "description": "Hide featured notebooks on NotebookLM — dashboard section and top-nav tab.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{e52c77f0-a814-4ad9-bedb-992d83faf02d}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "16": "Assets/icon-16.png",
    "48": "Assets/icon-48.png",
    "128": "Assets/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://notebooklm.google.com/*"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ]
}