Firefox

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

1. open each page
2. bookmark it
3. sort the bookmark into some appropriate folder in the corect order (if one refers back to an earlier topic instead of re-elaborating, I'll want to read the earlier one first)
4. close it
5. go through those "saved for later" folders
6. reopen them
7. delete the bookmark when I'm done with that page

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?