prefs: [media.mediasource.experimental.enabled:true]
lsan-allowed: [Alloc, NewEmptyScopeData, XPCWrappedNative::GetNewOrUsed, js_new, mozilla::BasePrincipal::CreateCodebasePrincipal, mozilla::dom::ChromeUtils::GenerateQI, nsStringBuffer::Alloc]
leak-threshold: [default: 51200]