Firefox is launching a new version, Firefox 3.0 on June 17th. Being a Firefox user for some time now, I can highly recommend that you use Firefox. Also, I have personally used the beta versions of Firefox 3.0, and I can vouch for the fact that it is indeed faster than previous versions, as promised by the developers.
Regarding this new Firefox version, do have a look at their attempt at a World Record. Firefox 3.0 is attempting to have the largest number of downloads in the space of 24hrs, and they request that you download the lastest 3.0 version on June 17, the day it is launched.
I will encourage you to use Firefox anyway, and since you will need to download it anyway, why not do it on June 17, and help Firefox out a little bit?
And did I mention (if you didn’t know already) that Firefox is free? Happy surfing!