Examine source code of Scheduled Data Cleaner

{
  "name": "Scheduled Data Cleaner",
  "short_name": "scheduled-cleaner",
  "description": "Automatically clear cookies, cache, history, and other browsing data on a schedule, with per-domain cookie exceptions.",
  "manifest_version": 2,
  "version": "2.5",
  "icons": {
    "48": "icons/scheduled-cleaner-48.png",
    "128": "icons/scheduled-cleaner-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "scheduled-cleaner@local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/scheduled-cleaner-48.png",
    "default_title": "Scheduled Data Cleaner: Click to open settings"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "permissions": [
    "alarms",
    "browsingData",
    "cookies",
    "history",
    "storage",
    "<all_urls>"
  ]
}