Just click the tota11y icon to run tota11y from Khan Academy and visualize how your site performs with assistive technologies.tota11y was just released by Khan Academy and was available as a bookmarklet. It seemed natural to create a Chrome extension. So here it is. All this does is inject the tota11y script onto the page.
See tota11y's website for information how to use it: http://khan.github.io/tota11y/
Notes:
The source code is available on https://github.com/kvasir/tota11y-chrome and was made with love by John-Philip Johansson and Michael Strömberg Razmgah.