Bug 13543: Spoof smooth and powerEfficient for Media Capabilities

dom/media/mediacapabilities/MediaCapabilities.cpp

@@ -290,6 +290,11 @@ already_AddRefed<Promise> MediaCapabilities::DecodingInfo(
                           if (aValue.IsReject()) {
                             p = CapabilitiesPromise::CreateAndReject(
                                 std::move(aValue.RejectValue()), __func__);
+                          } else if (nsContentUtils::
+                                         ShouldResistFingerprinting()) {
+                            p = CapabilitiesPromise::CreateAndResolve(
+                                MediaCapabilitiesInfo(true, true, false),
+                                __func__);
                           } else {
                             MOZ_ASSERT(config->IsVideo());
                             if (StaticPrefs::media_mediacapabilities_from_database()) {