diff --git a/layout/generic/test/mochitest.ini b/layout/generic/test/mochitest.ini
index da7d29aa0c28..f745cfd043e0 100644
--- a/layout/generic/test/mochitest.ini
+++ b/layout/generic/test/mochitest.ini
@@ -80,7 +80,6 @@ support-files = bug633762_iframe.html
 [test_bug756984.html]
 fail-if =
     os == 'linux' && os_version == '18.04'  # Bug 1600208 permafail on ubuntu1804
-    xorigin
 [test_bug784410.html]
 [test_bug785324.html]
 [test_bug791616.html]