Firefox is a safer and better browser anyhow April except for facebook. But is does stop all those phishing adds and adverts that you get on there...
A good moral reason for using Forefox over IE would be this...
The last version of IE can now only be installed on Windows, but Firefox can also be installed on other operating systems.
Are you really cool with supporting such an exclusive company such was Microsoft. Fuck the corporate giant that forces PC users to conform to using only their products.
IE leaves you way too open to anal attacks from Trojans spyware and other malware.
The major differences that come to my mind immediately are:
-- Firefox has tabbed browsing; IE just opens new windows
-- Firefox has built-in pop-up blocking.
Also, since IE comes automatically with most Windows installations, and because most people lack the [inclination/expertise] to switch to a non-IE browser, ~70% of PC users use IE. So whenever someone wants to write malicious code (spyware, virus, etc...), they will write it for the widest installed base.
As a result, many bad things that happen on the 'net don't affect PCs browsing with Firefox.
Whos using what broswers now this is dated from back in 2008 but you get the idea.
Internet Explorer: 70.72%
Firefox: 20.27%
Safari: 6.77%
Opera: 0.73%
Netscape: 0.48%
Chrome: 0.78%
Other: 0.24%"
Most crackers usually find it not worth the hassle to find hidden flaws in PCs when you can easily exploit the many publicly-known security holes in commonly used web browsers So you are 70% more likely to have shit show up on your computer that can compromise your security when using IE vs a much smaller chance with Firefox or other browser.