Javascript is too fast how do I slow it down? Also FireFox sometimes doesn't close and I need to kill the process.

The javascript is greatly accelerated for some reason. It runs faster than any other browser, but doesn't load faster if you know what I mean. And that is Google chrome is faster at loading, but runs at the intended speed. While FireFox runs the script as fast as possible. So, how can I slow it down to get java based web apps to run as intended. Also I think this could be a problem with flash instead of jave, but I don't know.

Lastly, sometime when I close FireFox (pay attention to the "sometimes" part), I have to kill the process, because it doesn't really close. How do I fix this as well.