you can try out this directly here (works only in chrome)
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firefox is mission speech recognition
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chromium is mission speech output
You can click on ask to make to make a single request. Or you click on start to have a continuous listening where you can start with "Hallo Computer" a small conversation. In both cases "Hilfe" will provide you with a list of commands you can ask. Some of the commands are only working inside the synyx-network.
Quellen:
Firefox is not supported at the moment: * https://bugzilla.mozilla.org/show_bug.cgi?id=1248897
Chromium: * https://askubuntu.com/questions/761975/chromium-is-not-generating-voice chromium-browser --enable-speech-dispatcher