[jeroenhd]

> I don't know about Gmail, but Google Translate won't let me use speech functionality in Firefox.

Speech output works fine here (Firefox, Ubuntu 23.04). I remember needing to install some kind of system speech synthesis feature on my OS to get web speech to work, though, because Firefox doesn't have one of their own like Chrome.

As for speech input: Firefox doesn't implement the recognition part of the Web Speech API (demo here https://mdn.github.io/dom-examples/web-speech-api/speech-col...). In fact, every implementation is one with a browser prefix (https://caniuse.com/speech-recognition) so it's no wonder Firefox isn't supported yet.

As for Teams: Microsoft doesn't care about the 3% Firefox users they get and they simply don't test, that's my conclusion. Back when Teams simply threw up a "your browser is not supported" the whole thing worked 95% if you spoofed the user agent and the modifications to fix the rest weren't all that hard (Firefox has some audio input/output implementation differences).