Breaking voice in Google Meet (Hangouts) with Firefox

Lot of ppl kept telling me how much distortions are there when I'm talking over Google Meet - not that everithing I say is gold, but sometimes I just want to get answer to my question :-) I'm using some (cheap) KOSS headset which connects via USB and integrates its own sound card.

After some digging this is what I did:

1. Enabled Echo/Noise-Cancellation module on PulseAudio (PulseAudio is a sound system in Linux - it is a proxy for sound applications) and disabled automatic analog gain control: Enable Echo/Noise-Cancellation (AFAICT this means PulseAudion won't attempt to automatically increase volume of the mic when I'm quiet) - you might not need this step as to me it is hard to believe sound server would have this bad results (note that you run pulseaudio -k as normal user - that "$" - and I had to restart Firefox I have been using to play some sound to hear the difference)
2. Then I have disabled automatic gain control and friends in Firefox: Disable WebRTC audio post processing
3. Hearing what you are recording was very useful: Echo test (to stop it, just use $ pactl unload-module module-loopback)

Note I'm on fedora-release-30-6.noarch, firefox-76.0-2.fc30.x86_64 and pulseaudio-12.2-9.fc30.x86_64.