That's actually a feature I tend to use quite often, especially when researching something - when I finally find the page that (best) tells me what I want to know, I can get rid of all the others that led me there. What exactly is the horrible horrible overhead that the maintainers have to put up with to keep these features in the main branch?
Meanwhile, another thing that drives me crazy is that Chrome will close a window with 19 active tabs without a single complaint. At least Firefox will ASK if you want to close a window with multiple tabs. But in Chrome, a single brainfart/mouso will cost you bigly.