Examine source code of Extensry

{
  "manifest_version": 2,
  "name": "Extensry",
  "author": "Prakash Sakari",
  "version": "1.0.2",
  "description": "Extensry is a super cool extension that greets you with a message according to the time of the day and shows different background on page refresh. With Extensry you can set your main/focus task of the day ansd also create your own todo.",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e140641f-16a4-4a3b-aa1e-9f77027aeb75}"
    }
  }
}