I'd go exactly the opposite direction: If the browser is the only important thing, surely it's best to have as little overhead to running that browser - every byte of memory wasted on something else is a byte the browser could have used (and it needs enough of them!), every running process uses time and battery that the browser could have taken, every additional package/program/library is security risk on top of the secure(ish) sandbox where your real (web)apps are running.