--- a/testing/web-platform/meta/webrtc/RTCPeerConnection-setLocalDescription.html.ini
+++ b/testing/web-platform/meta/webrtc/RTCPeerConnection-setLocalDescription.html.ini
@@ -8,16 +8,17 @@
 
   [Set created offer other than last offer should reject with InvalidModificationError]
     expected: FAIL
 
   [Creating and setting offer multiple times should succeed]
     expected: FAIL
 
   [setLocalDescription(offer) should never resolve if connection is closed in parallel]
+    disabled: https://bugzilla.mozilla.org/show_bug.cgi?id=1383069
     expected: FAIL
 
   [setLocalDescription() with valid answer should succeed]
     expected: FAIL
 
   [setLocalDescription() with type answer and null sdp should use lastAnswer generated from createAnswer]
     expected: FAIL