I don't know.. but.. it's the way people may use the computer. A former colleague used exactly one window, no matter if it's word or any other software. And most important: the other programs have to be closed, firstly, before switching to eg. browsing. Even my 85y old grandfather who bought his first computer with 73y is capable to use more then 2 windows at once.

So for me, i work with chrome, edge and Firefox (main) at the same time. Firefox is 3 Windows with 150 tabs each. Chrome for quick and dirty - when I visit or do something I know I won't need it later anymore - and edge is used for being chat and/or differential search with goog and bing and other search engines (I know, it's easier to use a meta search engine, but it's ok like I do)

So.. basically. Each window is a room space in my brain for me and I store knowledge in separated rooms, so I know exactly where the tabs are I'm searching for. It's like a library where I always can look up something. Using favorites within the browser is not possible for me, because I just forget about them. Not so if I work with all the thousands of tabs open :)

So, it's possible to use different browsers without saying "maehhh.. but, I .... "