Without starting any holy war arguments, why is Chrome adoption so high?

On the Windows machines at work, I use both Firefox and Chrome all day long for customer support and light web development. They're both pretty interchangeable for me, neither really being any better than the other. Since such high adoption of Chrome means the general public are using it, not just the more tech-saavy people like us, I doubt the reason is any deep developer niceties. So I don't really know why...