I believe Firefox use separate processes per tab and most of them are over 100MB per page. And that's understandable when you know that each page is the equival

I believe Firefox use separate processes per tab and most of them are over 100MB per page. And that's understandable when you know that each page is the equivalent of a game engine with it's own attached editor. A desktop app may consume more, but it's heavily focused on one thing, so a photo editor don't need to bring in a whole sound subsystem and a live programming system.