diff --git a/testing/web-platform/meta/html/browsers/sandboxing/sandbox-disallow-scripts-via-unsandboxed-popup.tentative.html.ini b/testing/web-platform/meta/html/browsers/sandboxing/sandbox-disallow-scripts-via-unsandboxed-popup.tentative.html.ini
index 0b6c6239111b..0a9729a23140 100644
--- a/testing/web-platform/meta/html/browsers/sandboxing/sandbox-disallow-scripts-via-unsandboxed-popup.tentative.html.ini
+++ b/testing/web-platform/meta/html/browsers/sandboxing/sandbox-disallow-scripts-via-unsandboxed-popup.tentative.html.ini
@@ -1,5 +1,9 @@
 [sandbox-disallow-scripts-via-unsandboxed-popup.tentative.html]
-  expected: TIMEOUT
+  bug: 1600442
+  expected: 
+    if release_or_beta: ["OK", "TIMEOUT"] 
+    TIMEOUT
   [Sandboxed => unsandboxed popup]
-    expected: TIMEOUT
-
+    expected: 
+      if release_or_beta: ["FAIL", "TIMEOUT"] 
+      TIMEOUT