We need to keep IE the best. We need to innovate in IE, do more add-ons, do improvements. We have some very exciting plans there. Some percentage of users are going to try Firefox and IE side by side, and use the one that's best.
So no big problem; it's not that people have stopped using IE, it's just we've got lots of good ideas that can match and move ahead."
You can interpret that as you wish.
I read it as Bill saying IE needs innovation and improvements to match and move ahead of Firefox.