This tool requires frames. Sorry.
Designed without frames, you end up with way too much redrawing and
rendering. Please return with a frames capable browser with frames
client-side image maps. Most modern GUI web clients support frames,
you'll be able to access with these features enabled, please see
the colorblind colorlab's documentation.
While the colorlab requires frames, the color filter does not.
The colorblind color filter allows you to see your own web page
through color blind eyes. It is currently in early development,
but you're welcome to try it out: