Examine source code of nuTab

{
  "name": "nuTab",
  "description": "Capture your thoughts and save favorite pages in a new tab",
  "version": "1.1.2",
  "manifest_version": 2,
  "icons": {
    "128": "icons/icon.png"
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "nuTab",
    "default_popup": "popup/popup.html"
  },
  "chrome_url_overrides": {
    "newtab": "tab/tab.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0b4cda29-8934-49cc-9b90-1f20e0c6e9e9}"
    }
  }
}