https://developer.mozilla.org/en-US/docs/Web/API/Web_Speech_...
EDIT: According to other documentation, it is behind a config flag. If you enable it, it will send the data to Google's API through a Mozilla-operated proxy: https://wiki.mozilla.org/index.php?title=Web_Speech_API_-_Sp...
It looks like there is no offline version :(
https://developer.mozilla.org/en-US/docs/Web/API/Web_Speech_...
EDIT: According to other documentation, it is behind a config flag. If you enable it, it will send the data to Google's API through a Mozilla-operated proxy: https://wiki.mozilla.org/index.php?title=Web_Speech_API_-_Sp...