No offense to Bruce, as he's a great guy, but wtf does he have to do with the answer to improving browser user experience?
Today on Linux I have to restart Firefox every ~20min because it slows to crawl. I don't know why and don't really care, because it'll take an unknown amount of time to root cause and 6 months from now an OS or browser update is likely to cause something similar.
I'm not dissing the Firefox devs. Google seems to have more people to throw at this problem.