For me sadly it's the WebSpeech API. A lot of sites that use speech-to-text and text-to-speech break on FF and also the voices FF aren't nearly as good as Chrom

For me sadly it's the WebSpeech API. A lot of sites that use speech-to-text and text-to-speech break on FF and also the voices FF aren't nearly as good as Chrome. This bug has been pending for many years now and I don't think it ever going to be on their priority list soon.