>Totally orthogonal issues.

http://blog.ffextensionguru.com/2011/11/20/electrolysis-proj... Add-on were one of the major issues blocking Multi-process Firefox.

>Not to mention Firefox ate memory like a pig until recently, despite not having sandboxing.

Agreed. Sandboxed Chrome was like a gift from the IT gods back in the bloated FF3 days.

>Now it's somewhat better with post 16 stuff, but still it's slow. Chrome is much more responsive and fast.

Responsive and fast until it starts thrashing when your physical RAM gets all used up.