I had to install the French voice from Microsoft. But Firefox still spoke English even when I chose French in the Windows Speech Settings. It works in Microsoft Edge but there is a different problem there: it won't stop when I hit the pause button.
thanks for sharing! Cross-browser compatibility for the web speech API is really an issue. Unfortunately, different browsers behave differently (and not in a predictable way).
I'll have a look at this though. Thanks for sharing.