> Pushing the envelope in terms of interface is a really tricky thing to do. Each time you do it, there's a huge user outcry, and it does turn some users away or stops them from upgrading.

And the reason I like Firefox is because there's always a way to go back to the old behavior/UI without losing the benefits of the new underlying system. That is respectful to users, as opposed to the Chrome way where you take it or leave it at a corporation's whim.