Examine source code of Visual Web History Mapper

{
  "manifest_version": 3,
  "name": "Visual Web History Mapper",
  "description": "Map your web browsing history visually to understand your journey across the web.",
  "version": "1.0",
  "permissions": [
    "history",
    "tabs",
    "storage"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "visual-web-history-mapper@example.com"
    }
  }
}