I’m now using NetCaptor (multitab browser for IE, discontinued in favor of ), over a IE6 engine. It looks bad, but lots of websites don’t allow IE6 to work anymore.
I use explorer because it allows me to collect files (photos, videos, Flash games) for archiving. Firefox and Opera doesn’t allow that so I don’t use them at all. Very few websites out there actually are set to deny access through IE browsers, so I use Firefox only on those websites.