The really frustrating thing is that the gap hasn't only been growing. Firefox was far slower than Chrome for a long time, and over the past couple of years pulled off a pretty impressive catch-up, which is why I and others finally went back. Now Mozilla's laid off most of the team that executed that very catch-up with Servo. Either my anecdotal experience of the speed bringing people back is an overestimation, or Mozilla's management really are as inept as everyone seems to think.