Or Firefox. (writing this from Firefox on Thinkpad with 16GB of RAM)
slack alone is using 300mb. discord is using another 300mb.
Next highest single process is Firefox with 1G RSS and 5G Virt. I have 113 tabs open at the moment, although there's about 4G of RSS in "Web Content" processes which are firefox related.
I remember recently I freed 10GB of RAM just by restarting Firefox. I literally looked at Ubuntu's System Monitor. And I keep everything updated.
Tried to play with settings in about:config, made even worse and reset.
that's on linux, latest nightly.