diff --git a/public/locales/en/translation.json b/public/locales/en/translation.json
index 22251e4b60..f40bd32ed6 100644
--- a/public/locales/en/translation.json
+++ b/public/locales/en/translation.json
@@ -146,6 +146,12 @@
                 "install": "Epic Servers are having major outage right now, the game cannot be installed!",
                 "update": "Epic Servers are having major outage right now, the game cannot be updated!"
             },
+            "sideload": {
+                "confirmExit": {
+                    "message": "Any unsaved progress might be lost",
+                    "title": "Are you sure you want to quit?"
+                }
+            },
             "title": "Warning",
             "wine-change": {
                 "message": "We could not find the selected wine version to launch this title ({{selectedWine}}). {{newline}} We found another one, do you want to continue launching using {{foundWine}} ?",
diff --git a/src/backend/storeManagers/storeManagerCommon/games.ts b/src/backend/storeManagers/storeManagerCommon/games.ts
index 9f8a07b375..70815584b4 100644
--- a/src/backend/storeManagers/storeManagerCommon/games.ts
+++ b/src/backend/storeManagers/storeManagerCommon/games.ts
@@ -17,7 +17,7 @@ import { access, chmod } from 'fs/promises'
 import shlex from 'shlex'
 import { showDialogBoxModalAuto } from '../../dialog/dialog'
 import { createAbortController } from '../../utils/aborthandler/aborthandler'
-import { BrowserWindow, Menu } from 'electron'
+import { BrowserWindow, dialog, Menu } from 'electron'
 import { gameManagerMap } from '../index'
 
 async function getAppSettings(appName: string): Promise<GameSettings> {
@@ -65,7 +65,28 @@ const openNewBrowserGameWindow = async (
       browserGame.close()
     })
 
-    browserGame.on('close', () => {
+    browserGame.webContents.on('will-prevent-unload', (event) => {
+      const choice = dialog.showMessageBoxSync(browserGame, {
+        type: 'question',
+        buttons: ['Yes', 'No'],
+        title: i18next.t(
+          'box.warning.sideload.confirmExit.title',
+          'Are you sure you want to quit?'
+        ),
+        message: i18next.t(
+          'box.warning.sideload.confirmExit.message',
+          'Any unsaved progress might be lost'
+        ),
+        defaultId: 0,
+        cancelId: 1
+      })
+      const leave = choice === 0
+      if (leave) {
+        event.preventDefault()
+      }
+    })
+
+    browserGame.on('closed', () => {
       res(true)
     })
   })