Examine source code of History Auto-Cleaner

{
  "manifest_version": 2,
  "name": "History Auto-Cleaner",
  "version": "1.1",
  "description": "Deletes specific URLs from history when tabs are closed.",
  "permissions": [
    "history",
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "autohistorycleaner@example.com"
    }
  },
  "applications": {
    "gecko": {
      "id": "autohistorycleaner@example.com",
      "strict_min_version": "48.0"
    }
  }
}