--- a/dom/tests/mochitest/general/test_interfaces.js
+++ b/dom/tests/mochitest/general/test_interfaces.js
@@ -1184,17 +1184,17 @@ var interfaceNamesInGlobalScope =
     {name: "VRFrameData", releaseNonWindowsAndMac: false},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     {name: "VRPose", releaseNonWindowsAndMac: false},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     {name: "VRStageParameters", releaseNonWindowsAndMac: false},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "VTTCue",
 // IMPORTANT: Do not change this list without review from a DOM peer!
-    {name: "VTTRegion", disabled: true},
+    "VTTRegion",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "WaveShaperNode",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     {name: "WebAuthnAssertion", disabled: true},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     {name: "WebAuthnAttestation", disabled: true},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     {name: "WebAuthentication", disabled: true},