Mozilla Firefox - Do I have a Virus?

Its definitely not a virus. I had a similar problem like this where my firefox would crash whenever i tried to type in the address bar. I reinstalled firefox, but it kept happening. I umed it was due to a recent configuration change on my computer, but I wasn't about to undo the changes or go back to IE. So I started looking for other browsers and found Opera browser (Sorry Firefox) and its way better and way more stable and can do everything FF can without a bunch of plugins. Imagine you have a website up and your computer crashes. Its ok because when you launch Opera again after the crash it all comes back like it was. Neat right?