Common Factor Count Explorer

I was curious as to why factors and primes seemed to have little if any pattern and needed a way of visualising it, so I made this. Enjoy.

The below shows how many common factors there are for the two integers along the axis. It's zoomable (double click or use the buttons) and draggable.

This has been tested on Chrome and Firefox so far, please let me know if you have any problems on other browsers.