ipython/ipython — pull request #6437 by weichm (2014-09-08 19:19:13+00:00)
Title: "event" is not defined error in Firefox

see http://stackoverflow.com/questions/20522887/referenceerror-event-is-not-defined-error-in-firefox
"WebKit follows IE's old behavior of using a global symbol for "event", but Firefox doesn't..."