diff --git a/resources/prefs.json b/resources/prefs.json
index 85ae67919ad..a9478ae44c1 100644
--- a/resources/prefs.json
+++ b/resources/prefs.json
@@ -28,6 +28,7 @@
   "dom.webrtc.enabled": false,
   "dom.webvr.enabled": false,
   "dom.webvr.event_polling_interval": 500,
+  "dom.webxr.enabled": false,
   "dom.webvr.test": false,
   "dom.worklet.timeout_ms": 10,
   "gfx.subpixel-text-antialiasing.enabled": true,