Firefox is a pretty toy. It can be customized to no end and altered to just the right way suited for the user, but security is an issue. Active X is another, oh, and the most pain-in-the-arse part, no 64-bit flash plugins, not that the 32 bit ones were any better for linux. yay, tabbed browsing, who cares... IE7 has it as well, even if it was stolen, it's pretty hard to whine about someone stealing another persons free software idea. People have been doing that for years, MACOS & NeXTstep ring any bells here, well, in that case they just took the ENTIRE thing. But technology adapts and changes to things that are good. yes, firefox had a good idea, but now it has been improved and put in a browser that comes shipped standard on most PC's. I see no harm in that? unless if I'm reading correctly that the firefox open-sourcers are having a problem with free software trade or adaptation? weird huh?
Also webpages made on the most common editors such as frontpage, dreamweaver and such display their tables and alignment much more efficiently in IEx than firefox.