Firebird 0.7 is out.  While I prefer IE over Mozilla, I have taken a liking to Firebird because it is fast, easy to use (tab heaven), easy to install handy extensions, and has superior FTP and i18n support.  I am seriously considering switching to Firebird as my main browser now.  As a developer, I'll still be using IE to test my web pages, but Firebird is too useful to ignore any more although there are still some odd kinks that needs to be fixed.  I sure hope Firebird development continues on.