Wow, this is extremely cool! Only problem, the JS slows my Firefox almost to freezing, is it normal?

Yes, this is normal. I am sorry, I am working on a more efficient implementation.

The JavaScript of this page does a lot of number crunching.

It is actually doing arithmetic on the Stern-Brocot tree. It is all written in ClojureScript and not really optimized yet. I mention in the paper that I do not even use TCO.

Anyway, thank you - and all the people here - for the kind words! I am so happy that my article was so well received today.