I'm not sure about Mozilla's efforts in STT, but they were lagging pretty far in TTS. [1] Google/Baidu, universities, and an assortment of Chinese/Japanese/Korean social media companies (Line, etc.) are posting the most compelling TTS research, models, and code. Mozilla's TTS system [2] is an amalgam of some of these models, but it lags pretty far behind state of the art. Mozilla should focus on getting additional re…
I also believe Mozilla team was restricted by a lack of computing resources. They had just a single 8GPU server or so.