Tabs have nothing to do with content.
RSS feeds (live bookmarks, great for FR),
Again, this has nothing directly to do with content. It is a user gadget.
quality popup blocking (SP2's isn't that good)
I like this about FireFox but again this has nothing to do with content. Windows XP SP2 makes IE block popups as well as FireFox.
Everything you mentioned are user gadgets - nothing to do with content. Browser war is won or lost on the content.
All of the above has sped up my web browsing a lot.
BTW: FireFox loads graphics 30% slower than IE
I have no interest in bashing FireFox. I like and use it.
He didn't say content, he said features. Those are all features of FireFox that IE doesn't have. Content is on the web, that's going to be the same for all browsers.
Everything I mentioned lets me access my content more quickly and efficiently. I like that.