Examine source code of Panorama Tab

{
  "manifest_version": 2,
  "name": "Panorama Tab",
  "version": "2.0.2",
  "description": "New tab replacement with a unique look and style.",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "icons": {
    "16": "/icons/icon16.png",
    "48": "/icons/icon48.png",
    "96": "/icons/icon96.png",
    "128": "/icons/icon128.png"
  },
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "permissions": [
    "https://*/",
    "http://*/",
    "topSites"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0e13dd33-a693-4c63-aaed-8061a417426c}"
    }
  }
}