Dunno why some people say Firefox is slow or its worser then IE (loool, ROFL, *clinmbs a wall*)

The first thing also it is not that great (but i think its great) is the tabbed browsing switched one year ago to firefox and cant live without that feature anymore lol.
Second Thing is the very easy to handle popupblocker (no stupid bar that doesnt fit in your browser because its a ugly thing from the start lol)
When something doesnt get blocked you can manually block them.
Ok the third Thing is that Firefox is faster then IE in many ways.
IE has a short time before you get an timeout when a server is at its limit or has a high ping.
When you cant get on a website strg+F5 works (not like in IE where you hit it 1000 times and everytime get the same response lol.
OK the next Thing is the vulnerability from IE and from Firefox sure every browser has its vulnerable point and yeah 100% security is a unreal and childish dream lol.
IE is so vulnerable because the most people never used other browsers so the scriptkiddies concentrate mostly on the popular thing.
Firefox is maybe not perfect but in many ways superior to IE (i liked IE but at the point where i got tons of trash on the PC is simply switched to firefox)
You know the most crap you can get without notice comes through IE (dialers trojans etc etc) and thats not a subjective view its simply the way it goes.

Another great thing is the community who develops tools plugins and extensions and the variable skins usage.

ITs simpler to modify the Firefox for the own usage then to make IE comfortable.