In contrast, I often organize my browser tabs onto multiple separate windows (even when I don't have that many open), because opening programs in windows and jumping between them is something I do a lot, and it's baked in very nicely to my window manager :)
To avoid misinterpretation since text is horrible this way: I am NOT disparaging or even really disagreeing with the parent comment. They're just two different workflows, and while I appreciate the advantages of the browser, apps work better in mine.
Firefox recently learned --ssb (after you enable that in about:config), but it's use is much more limited, geared towards kiosks. Things like right mouse button and extensions are disabled, and you cannot open external links.
https://superuser.com/questions/101395/is-it-possible-to-hav...
https://www.howtogeek.com/403399/how-to-make-chrome-open-as-...
So it's like having an Electron app with stricter sandboxing, less memory usage, and an easier installation / upgrade process.