Examine source code of New Tab Plus

{
  "manifest_version": 2,
  "name": "New Tab Plus",
  "version": "1.3",
  "description": "New Tab Plus allows you to specify which website opens when you open a new tab.",
  "developer": {
    "name": "Andy Bajka"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "cookies",
    "history",
    "storage",
    "tabs"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "bcd339e2-fee5-40fd-8acd-2021a8815b95@bajka.com",
      "strict_min_version": "103.0"
    }
  }
}