Examine source code of Delete History

{
  "manifest_version": 2,
  "name": "Delete History",
  "author": "Erlend Eelmets",
  "version": "0.1",
  "description": "App to delete history",
  "icons": {
    "36": "icons/android-icon-36x36.png",
    "48": "icons/android-icon-48x48.png",
    "72": "icons/android-icon-72x72.png",
    "96": "icons/android-icon-96x96.png",
    "144": "icons/android-icon-144x144.png",
    "192": "icons/android-icon-192x192.png"
  },
  "browser_action": {
    "default_icon": {
      "36": "icons/android-icon-36x36.png",
      "48": "icons/android-icon-48x48.png",
      "72": "icons/android-icon-72x72.png",
      "96": "icons/android-icon-96x96.png",
      "144": "icons/android-icon-144x144.png",
      "192": "icons/android-icon-192x192.png"
    },
    "default_title": "Auto Delete History",
    "default_popup": "main.html"
  },
  "permissions": [
    "history"
  ]
}