I prefer Firefox to Internet Explorer. One problem that I have is the jumpiness in Firefox when watching video. I know that other have it, too as when I post video of my own, I often get the comment back about how annoying it is…
Thanks to Joe.My.God blog there is a link on lifehacker for a VERY easy fix. Apparently, Firefox is set to save tabs every 10 seconds. If you don’t need to save these settings that often, by following these instructions you can change those settings and make Firefox more pleasant for videos and video sites like You Tube. I have been using other browsers just for video because of it, so I hope that this will do the trick! Go here for the article!
Firefox Jumpiness
Written by Robert Stockham

Worth a shot! Thanks, Robert!