I have been comparing IE8, Firefox and Google Chrome for a few weeks now.
Firefox is the most sluggish and has lots of little annoyances now.
IE8 is truly superior to any IE ever – by miles. It is also superior to Firefox now – a lot.
Google chrome is very nice once you get used to it. Clean, fast and with lots of useful features.
Firefox is failing to stay with the times… IMO while once the most advanced it is now the least advanced of the three.
Just my opinion…