IE is almost equal to Firefox, in their 'out-of-the-box' configurations, but with the add on's available, it's no contest: Firefox wins.
This list is a few of the essential items you should have.
Note that the Internet is so fluid and dynamic, and exploits crop up almost hourly, it is imperative to stay current with all phases of Windows defensive measures, and keep all rubbish out: stopped @ your doorstep.
►Ghostery (reveal the web bugs, ad networks and widgets on every page);
[After install it MUST be turned "ON": FF Tools> add-on's> Extensions> Ghostery> Options button> Blocking tab> "Select" All & "ON"> Save.
[Thanks "SurfUp" contributor].
►Web of Trust:
Most of these will confine your interaction with a website (which is a good thing: i.e. allowing you to verify if you want the interaction), but on the other hand, they speed up browser page loads, as they block a lot of the 3rd party assets being requested from remote servers.
►Special note: Firefox has been hacked by Microsoftie.
Microsoft has installed, (unknown and unannounced) to Firefox, rubbish that degrades the security of Firefox to little more than IE.
Check your FF 'Add-on's'> "Extensions" & "Plug-in's" box and disable NET framework, Windows Presentation Foundation, Shockwave, Silverlight, Java stuff, or other active scripting rubbish.
· 10 years ago