Check out Orion! It's a Webkit-based browser like Safari but the devs also ported the extension APIs from Chrome and Firefox, so you can install Chrome and Fire

Check out Orion! It's a Webkit-based browser like Safari but the devs also ported the extension APIs from Chrome and Firefox, so you can install Chrome and Firefox extensions. It's Mac-only and in beta but, there's tons of features that could be worth checking it out.