Examine source code of Take Notes

{
  "name": "Take Notes",
  "description": "An offline full-screen responsive text-editor.",
  "version": "5",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_action": {
    "default_title": "Take Notes",
    "default_icon": "img/pencil.svg"
  },
  "permissions": [
    "tabs"
  ]
}