I also have 64GB on my home PC and Firefox tends to get into bad states where it uses up a lot of RAM/CPU too. Restarting it usually fixes things (with saved t

I also have 64GB on my home PC and Firefox tends to get into bad states where it uses up a lot of RAM/CPU too. Restarting it usually fixes things (with saved tabs so I don't lose too much state). But outside of bugs I can see why we're not at 100GB - even with a PopOS VM soaking up 8GB and running Firefox for at least a day or two with maybe 30 tabs, I'm only at 21GB used. Most of that is Firefox and Edge.