There’s a difference between “free” memory, and “available” memory.

I agree with this, and I'm sure most people complaining about Firefox or Chrome's abhorrent memory usage would too. The problem with most browsers is that they eat up the available memory and often do not give it back. So you end up with situations where you're running low on available RAM even though you have 32GB installed.

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Buy the memory, use as much of it as you can, as often as you can. Go wild with it. Enjoy.

Sure, if you release it when not using it, otherwise unlimited RAM privilege revoked. Memory leaks suck and when they chew up all your RAM and they continue to happen, offending apps should either be no longer used, or limited to their minimum necessary RAM requirements to limit the damage they'll do.

Hence why I capped Firefox at 8GB, anything more would be wasted when it inevitably leaks.

[Desktop Entry]
Version=1.0
Name=Firefox RAM limit 8GB
GenericName=Firefox Ram limit 8GB
Comment=Limit RAM for Firefox to 8GB;
Exec=systemd-run --user --scope -p MemoryLimit=8G firefox
Icon=firefox
Type=Application
Terminal=false
Categories=Utility;Development;
StartupWMClass=Firefox