Examine source code of One Click Clear Cache

{
  "manifest_version": 2,
  "name": "One Click Clear Cache",
  "version": "1.2",
  "description": "Clear cache, cookies and history with one click.",
  "permissions": [
    "browsingData"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Clear Cache"
  },
  "icons": {
    "48": "icon48.png",
    "96": "icon96.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "yue.han@mdpi.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}