Examine source code of Gemini Layout Enhancer

{
  "manifest_version": 3,
  "name": "Gemini Layout Enhancer",
  "version": "1.0.0",
  "description": "Enhance Google Gemini with widescreen mode, split view, focus mode, and Markdown export",
  "homepage_url": "https://github.com/aleclee1005/geminienhancer",
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "gemini-layout-enhancer@aleclee",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://gemini.google.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}