Anyone know how to get TTS working

So I have installed a text to speech extension for Firefox however under select voice its empty (in windows I can choose the TTS I want to use)

I have tried installing libttspico-utils but still, nothing shows any ideas thanks

Have you tried without firejail?

firejail --noprofile firefox

same I should have said I am using firefox developer

Not sure. Maybe try installing different tts engines.