I've been staying with Firefox not for the performance (today Chrome loads Google sites like YouTube faster), but mainly for Tree Style Tab extension. I couldn't imagine opening more than a dozen of tabs without it.
I can't imagine having more than a dozen tabs open, period. You tab hoarders will never make sense to me...
So, I have groups for casual browsing, work, volunteer work, etc. So I don't have to close tabs when switching from one to the other. I just switch and those tabs are still there when I want to next look at them.