diff --git a/Explorer/Assets/DCL/NetworkDefinitions/Browser/UnityAppWebBrowser.cs b/Explorer/Assets/DCL/NetworkDefinitions/Browser/UnityAppWebBrowser.cs
index 32928a00c5..5153d42aba 100644
--- a/Explorer/Assets/DCL/NetworkDefinitions/Browser/UnityAppWebBrowser.cs
+++ b/Explorer/Assets/DCL/NetworkDefinitions/Browser/UnityAppWebBrowser.cs
@@ -1,6 +1,10 @@
 using DCL.Multiplayer.Connections.DecentralandUrls;
 using System;
 using UnityEngine;
+#if ALTTESTER
+using DCL.Diagnostics;
+using System.IO;
+#endif
 
 namespace DCL.Browser
 {
@@ -15,7 +19,22 @@ public UnityAppWebBrowser(IDecentralandUrlsSource decentralandUrlsSource)
 
         public void OpenUrl(string url)
         {
-            Application.OpenURL(Uri.EscapeUriString(url));
+            var escaped = Uri.EscapeUriString(url);
+
+#if ALTTESTER
+            // ALTTESTER builds write auth URL to disk and suppress the system browser so Playwright tests can drive their own browser to it.
+            try
+            {
+                var path = Path.Combine(Application.persistentDataPath, "auth-url.txt");
+                File.WriteAllText(path, escaped);
+            }
+            catch (Exception e)
+            {
+                ReportHub.LogException(e, ReportCategory.AUTHENTICATION);
+            }
+#else
+            Application.OpenURL(escaped);
+#endif
         }
 
         public void OpenUrl(DecentralandUrl url)