Examine source code of Current Date and Time

{
  "manifest_version": 2,
  "name": "Current Date and Time",
  "version": "1.0",
  "description": "Displays the current date and time in a popup.",
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{83036646-e341-455a-b927-0cadbd11f48b}"
    }
  }
}