I was working on a web development project. Until 30 minutes ago, I had discovered something strange with my code. It worked well on IE and Chrome but it created random results on Mozilla Firefox version 3.6.12. So i did some quick alert()s to find out whats went wrong. Surprisingly, I found out that if you pass a callback function that can accept parameter into setInterval. It will pass random numbers into the callback function when it wasn't suppose to. I tried to start Firefox in safe mode and run the test again. Unfortunately, the bug still exists.
Update #1: I just tested the code with setTimeout() it seems like setTimeout() is affected as well.
Update #2: I just filed a report at Bugzilla@Mozilla.
Update #3: It was my mistake. :P It isn't a bug but an inconsistency between browsers.