diff --git a/lib/renderer/inspector.js b/lib/renderer/inspector.js
index 3192aa160edb..fdb14b717013 100644
--- a/lib/renderer/inspector.js
+++ b/lib/renderer/inspector.js
@@ -6,6 +6,22 @@ window.onload = function () {
   window.WebInspector.createFileSelectorElement = createFileSelectorElement
 }
 
+window.confirm = function (message, title) {
+  const {dialog} = require('electron').remote
+  let buttons, cancelId
+  if (title == null) {
+    title = ''
+  }
+  buttons = ['OK', 'Cancel']
+  cancelId = 1
+  return !dialog.showMessageBox({
+    message: message,
+    title: title,
+    buttons: buttons,
+    cancelId: cancelId
+  })
+}
+
 const convertToMenuTemplate = function (items) {
   return items.map(function (item) {
     const transformed = item.type === 'subMenu' ? {