The feature is called Tab Unloading, and weirdly enough they made it not easy to access despite its usefulness.
You basically have to type about:unloads in the address bar and hit enter. If you then click on “Unload”, it will put the least used tabs to sleep. If you keep clicking that button until it’s greyed out, you’ll have unloaded all your tabs from memory.
This feature is handy if you want to temporarily switch to something that is memory hungry without having to close your 100 tabs.
Especially for school, I would have 10 to 15 tabs open per research rabbit hole. With lots of different assignments due, I’d have maybe 3 or 4 of these going at a time. It’s much easier to keep them open than to bookmark them and try to find them later.