That’s why people like single tab browsers. Then you leverage a tiling manager like i3 or sway to manage the windows
That's such a wasted design opportunity - give the users freedom in using a proper text editing tool instead of whatever awfulness the OS designers got stuck in decade(s) ago
But there are many other minimal UI browsers as well as Firefox that support no tabs.
I’ve been using qutebrowser which doesn’t have much of a UI since it is vim based
I'm using Firefox with a custom userChrome.css:
#TabsToolbar { visibility: collapse !important; }
Works quite ok but I cannot disable opening tabs completely in Firefox.