Examine source code of Tab Explorer

{
  "manifest_version": 2,
  "name": "Tab Explorer",
  "version": "3.1",
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "description": "New tab page showing tabs as a file explorer",
  "permissions": [
    "tabs",
    "topSites",
    "search",
    "storage"
  ],
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{aedf5a6d-88bb-4b4c-b08c-885ed722dade}"
    }
  }
}