Examine source code of Window Manager

{
  "manifest_version": 2,
  "name": "Window Manager",
  "version": "2.1.1",
  "description": "Saves Windows to folders to view later.",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "tabs",
    "storage",
    "sessions",
    "menus"
  ],
  "sidebar_action": {
    "default_title": "Windows",
    "default_panel": "sidebar/sidebar.html",
    "default_icon": {
      "64": "icons/WWW.png"
    }
  },
  "browser_action": {
    "default_icon": {
      "64": "icons/WWW.png"
    }
  },
  "web_accessible_resources": [
    "icons/WWW.png",
    "icons/archived.png",
    "icons/openButton.png",
    "icons/closeButton.png",
    "pages/localFile.html",
    "pages/localFile.css",
    "pages/localFile.js"
  ]
}