Hmm, I was surprised by a comment I read here that said the new Netscape, though based on Firefox, also supported using the IE rendering engine built into Windows. This is backed up on the Netscape site. If you hit a site that doesn't render correctly you can click an icon to switch to the IE engine. You can also tell it to remember the choice for that site. Now that I think about it, why not? My favorite browser, Avant, is just a wrapper that leverages the existing IE engine. Firefox compatibility is really good, so this isn't that big an issues anymore, but it would have been really helpful back in the early Mozilla days.