How to access oldish Dell DRAC console? Install old Firefox and Java in Docker container

Sometimes I need to access DRAC console (i.e. "remote screen") of some older Dell system - in this case it is PowerEdge R610 and "About" says "Integrated Dell Remote Access Controller 6 - Enterprise, Version 1.98, © 2008-2011 Dell Inc.". I have tried bunch of browsers on my not super recent Fedora 30 and it failed. One solution I have found is to access the console with Firefox and IcedTea plugin from Fedora 27. VM feels too heavy for this usecase, so just allow connections to my X server:

# xhost local:root

start Fedora 27 container with some extra vars and mounts:

# docker run \
        --network host \
        -e DISPLAY=:0.0 \
        -v /tmp/.X11-unix:/tmp/.X11-unix \
        -v /root/.Xauthority:/root/.Xauthority:rw \
        -ti fedora:27 /bin/bash

and then in the container install all needed and run the browser:

# dnf -y install firefox xorg-x11-xauth icedtea-web
# firefox

Now I'm able to open the console, hooray!

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.