> Version 1.2 (today) introduces the shortcut "shift+b" to build program, which will show you the compiled Js output for Fire programs. You can also use "command+shift+b" to build and save to file.

This is interesting, but might actually work at cross-purposes to what you want to show. This presents it as "a graphical interface to write javascript", which isn't quite what you want. I want to _run_ the code, not just compile to js. (Obviously compiling to js and then running the js is fine, but don't make me do two steps when one is enough)

But for a run button, I'd think you want this to be as obvious as possible. So don't even bury it in a menu -- make a header with a giant "run" button. Or maybe not "giant", but somewhere that's displayed when you open the page.

> Another person emailed me and said it should start with "hello world", and not Fib. That's coming soon.

I feel like you want to have both. But yes, it's useful to have Hello World.