Back when I first started using Chrome (I think in 2008), I used to describe it as a weekend race car with all the seats, upholstery, and HVAC stripped out. Fast, no frills.
Firefox, on the other hand, was your 1970s custom van with a cool wizard painted on the side, really comfortable seats, and lots of room for further customization. Not fast, but certainly versatile and designed to your liking.
IE7, naturally, was a Yugo.