[andreastt]

So Firefox does support multi-processed tabs through Electrolysis (its IPC layer). From what I understand this is used primarily on Firefox OS to sandbox app runtimes.

Doing one process per tab, which is what Chrome does, comes at a very steep cost in increased memory usage. If you compare a Chrome and Firefox instance holding 20 or 30 tabs, the memory consumption is going to be dramatically different.

Bill McCloskey did a nice writeup on this back in December: http://billmccloskey.wordpress.com/2013/12/05/multiprocess-f...

His article explains how you can try out the experimental multi-process support in Firefox, but that it works differently to Chrome's. I think Chrome's way of doing it wastes a lot of system resources and that we need to be more clever about how we spend a user's system resources.