Along these lines, it would be cool if browsers supported some sort of "LispScript" (or at least "SchemeScript"). I hate JavaScript with a passion. This is all just wishful thinking, of course. And yes, there is a LispScript project, but it compiles to JavaScript. I'm thinking more of a native interpreter in the browser.
I think most people who "hate javascript", dislike working with the DOM, is that true for you? I personally think javascript is a pretty simple & beautiful language. It has its warts, but so does ruby, python, and other dynamic languages.
Yes, I'm aware of Firebug; it's nice (although it seems to have gotten buggier).