the first time i encountered it it was an advertisment (my webpage would go to mozilla.fox. "waste of my time". com) on a virus i got, and i dont think its any diffferent than spam
Never heard of Firefox resorting to that kind of behavior, probably something trying to resemble firefox in some way or manner
It's my primary browser
I use IE only when I have too,
With the addons you can get with firefox, it is customizeable
To many to name, but a couple I enjoy are forecastfox and adblock
Of course I also have IE View lite addon for the times I need to open a page in IE
Even if you don't use it, consider it a backup browser for IE, if you can't connect with IE to the internet for some reason then try your backup browser