prefs: [dom.media.webcodecs.enabled:true, media.ffmpeg.encoder.enabled:true] disabled: if (os == "linux") and (bits == 32): Not implemented lsan-allowed: [PLDHashTable::MakeEntryHandle, mozilla::RemoteDecoderManagerChild::OpenRemoteDecoderManagerChildForProcess, mozilla::ipc::MessageChannel::MessageChannel, mozilla::layers::GPUVideoImage::GPUVideoImage]