Examine source code of Auto History Cleaner

{
  "manifest_version": 2,
  "name": "Auto History Cleaner",
  "version": "1.0",
  "description": "Automatically clears browsing history every X minutes.",
  "permissions": [
    "browsingData",
    "storage",
    "alarms"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{baefa636-da20-46a8-9c33-2a2b0892f8b5}"
    }
  }
}