Examine source code of MyTab - New Tab

{
  "manifest_version": 2,
  "name": "MyTab - New Tab",
  "version": "1.0",
  "description": "Customizable new tab",
  "icons": {
    "128": "icon.png"
  },
  "browser_action": {
    "default_title": "Customize The Tab",
    "default_popup": "popup.html"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5cd900df-2c49-48fb-9bb0-3a94b8f7b5ee}"
    }
  }
}