haha... Ya i have FF too... same dif as Mozilla really. And they're both just NS under a dif skin.
Well... if you want to get technical about it... First there was Mosaic, then there was an offshoot of mosaic called mozilla, which became NetScape. But for all intents and purposes, yes, they are basically the same. The big difference between FireFox and Mozilla core is efficiency of design. FF is the mozilla core code but refined. They've taken out all the extras like the mail client and such to leave just a sleek web browser. You can download other componets, but FF is
just the web browser. They've also taken out a lot of the UI components that slow down core Mozilla, which means that it takes better advantage of the UI APIs... basically it means that it renders the browser quicker.
From an end user point of view though, there are basically IE, NS/Mozilla, Opera, and Safari for macs... with a few taggers on in the fringes.
As for features. Basically Mozilla is fully customizable. So if there are any features missing, check out the "extensions" site listed in the preferences. You can download an extension for just about ANYTHING.
I hear about how IE renders pages no matter what a lot. Half the time you aren't seening pages correctly in IE and don't realize it because they go to lengths to hide it from you. With mozilla and other browsers gaining popularity, we're going to see more and more pages that are coded to standards, which is going to leave IE out in the cold unless Microsoft buys another browser from someone.
Two fun things:
1. In mozilla's location bar, type about:mozilla
2. In IE, goto help > about Internet Explorer. See who ACTUALLY made it. (hint, they've been out of business for a while)
Personally... I don't have any vested interest in mozilla per se, I just like using what works. My experience is that FireFox is the best browser around. Take it for what it's worth, YMMV.