Examine source code of Markdown Viewer

{
  "manifest_version": 2,
  "name": "Markdown Viewer",
  "version": "1.0.0",
  "description": "View Markdown (.md) files directly in Firefox.",
  "icons": {
    "48": "icons/icon48.svg",
    "96": "icons/icon96.svg"
  },
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "browser_action": {
    "default_title": "Open Markdown Viewer",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "markdown-viewer-4e0ce5@example.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}