I recommend Firefox to all my clients for all the reasons listed above and it has lot of handy add-ons. If you have Firefox, make sure you download the recommended add-on "Ad-Blocker Plus". Ad-Blocker blocks Ads from being downloaded, which results in quicker page loads. The Accuweather module is nice too.
Also, Firefox will spell check text you type into web pages.
Lastly, if you want to avoid viruses, spyware, maleware, etc., then it is a good idea to use the stuff the hackers are using (i.e. Linux, firefox, openOffice).
