Fix according by binding all browser-specific transitionend events. Detection mechanism we use to determine which transitionend event to use is broken in Chrome dev build (26) and Firefox 18. Likely a bug to send to browser venders (TODO: Writeup minimal testcase on JSFiddle!)
Better one line fix
Merge remote-tracking branch 'origin/master' into fix-accordion
Merge pull request #97 from mobify/fix-accordion

fix accordion bug in latest Chrome and Firefox