Based on feedback from Steve Zellers, I downloaded and tried Chimera.. nee, Navigator (why call it Navigator?) this morning.

It looked very nice, but it wasn't much use to me since it wouldn't let me type into any of its text fields!

Obviously this isn't the case with other people since people are using it as their default browser, but I've tried launching it a few times and it's the same result. I can use keystrokes like Cmd-L to select the location bar, but if I try typing into any text field, it just beeps at me.