there are many things that are easier to apply to single processes as opposed to multiple (killing, affinity/priority, sandboxing/permissions Sandboxing is eas

there are many things that are easier to apply to single processes as opposed to multiple (killing, affinity/priority, sandboxing/permissions Sandboxing is easier with more processes, at least if the processes are split up to make this easier. One of the reasons for e10s is to allow for sandboxing, so it is now easier to apply sandboxing rules to Firefox. anecdotally I've found there is overhead for each tab process (of which I may have a ton of very tiny ones in my tree tabs This is understood and one reason why Mozilla is conservative here.