[Seirdy]

Chromium and dreivatives had this for years. Firefox's isolation is making progress, but it has a ways to go before it matches Chromium.

FF devs are finalizing a utility process overhaul and laying the groundwork for CFI; for years, Chromium has had both with a much more thorough implementation than FF will in the near future. However, the browser space desperately needs competition so I'll take what I can get. Sigh.