I would like to see an option in preferences for no tabs. None. I hate tabs. If your answer starts out “why do you hate tabs?” or “tabs are helpful”, it is the wrong answer. There was an extension for Mozilla Firefox called Tab Killer but it is no longer available for the current version of Firefox. It seems stupid to build in a feature, then have an extension to disable it. Why not have the option to disable it in preferences?
P.S. I really hate tabs.