Examine source code of YourTab StartPage

{
  "manifest_version": 2,
  "update_url": "https://clients2.google.com/service/update2/crx",
  "minimum_chrome_version": "32",
  "version": "1.8resigned1",
  "name": "YourTab StartPage",
  "description": "StartPage with customizable interface, quick access and weather forecasts",
  "icons": {
    "16": "icons/16.png",
    "19": "icons/19.png",
    "36": "icons/36.png",
    "128": "icons/128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/16.png",
      "19": "icons/19.png",
      "24": "icons/24.png",
      "32": "icons/32.png",
      "36": "icons/36.png"
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "unlimitedStorage"
  ],
  "background": {
    "scripts": [
      "chromeapi.js",
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f739fd1b-0050-451b-b877-b8e049a56ed7}"
    }
  }
}