Hello , I am recently encountering problems on Firefox with setInterval and setTimeout functions. It seams that when you have for example slideshow or carousel running on the page and you switch on some other tab, there are some errors in javascript animation. It looks like it kinda queues all animations and when you switch focus to that tab again, then it does them very quickly , ruining slideshow or carousel with very fast animations. On chrome , IE, Safari it all works well, I just encountered this problems from Firefox 4+. Thanks on your help. p.s. Maybe it is my error in javascript, but it worked well before and it works well in other browsers.