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.
I use them as short term bookmarks, split into topical windows.
One is a bunch of articles on a blog that I wanted to read during my hour-long commute, two windows are for two different APIs I’m trying to work with for a hobby projext, one for a bunch of documentation pages for different features of different modules of the language I’m using. One is for various entertainment pages I’m using at home, where fast WiFi offers a better experience for watching videos and streams and such.
It’s perfectly possible to juggle those windows, and once I’m done with one of the APIs or the blog or something, I can just close the window to get rid of the tabs. It’s a convenient way to keep things open for either quick access or later reference without having to
or having to constantly navigate back and forth between different parts of the API and language reference and blog subpages.
So no, I’m not too dumb to close tabs, I simply have a different workflow. I don’t understand why you feel the need to insult people over enjoying something you don’t get, instead of trying to learn why it’s useful to them. Is there a particular reason to get offensive here?