Examine source code of Craft Shortcut Extension

{
  "manifest_version": 2,
  "name": "Craft Shortcut Extension",
  "description": "This extension will open a link directly in your Craft Product.",
  "version": "2.3",
  "browser_action": {
    "default_icon": "craft.png",
    "default_popup": "popup.html",
    "default_title": "Craft - Shortcut Extension"
  },
  "icons": {
    "16": "craft.png",
    "48": "craft.png",
    "128": "craft.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs"
  ]
}