Honestly, I'm not all that enthused about this. Once Safari segregated plug-ins to separate processes, I've literally not had a single crash from a stable version (there was a buggy nightly build about a week or so ago that crashed twice in a day — oh, the humanity!). I use my browser pretty much 16 hours a day, and can easily have 50+ tabs at any given point in time. Even though Chrome has extensions that I would appreciate, since each one of Chrome's tabs has to set up its own address space, it uses a significantly higher amount of RAM than Safari altogether — which makes Safari the browser I use 95% of the time.