I have 3 browsers - IE, FF and Google Chrome. When one acts flaky, I use another. Occasionally one hangs or FF won't do certain things because of the add-ons I use, so I open another.
No big deal
You should also use an overall cleaner to purge your internet files, caches, and other gunk from time to time. (CCleaner is good)
I have the same problem using Firefox. My browser freezes whenever the GFTForex ad is trying to load. (Bottom left of browser says "waiting for GFTForex")