Browser Splitting Was Useful Rated 4 out of 5 stars

I found quite a few uses for being able to split the view and see two things at once within the same window - it was a very useful functionality to have. Unfortunately, I have lost it because this doesn't work with Firefox 4.0. I really hope you or someone else will be able to come u pwith something that will work for 4.0, because I loved having this ability.