Bug 1661082 - Backed out changeset 5fdd97a2bd5b (Bug 1652568)

Differential Revision: https://phabricator.services.mozilla.com/D89172

dom/xhr/tests/mochitest.ini

@@ -83,6 +83,7 @@ support-files = window_worker_xhr_3rdparty.html
 [test_worker_xhr_headers.html]
 [test_worker_xhr_implicit_cancel.html]
 [test_worker_xhr_parameters.html]
+fail-if = (xorigin && fission)
 [test_worker_xhr_responseURL.html]
 [test_worker_xhr_system.html]
 [test_worker_xhr_timeout.html]