Mozilla Firebird 0.6 is out
From the Release Notes: "You can now install Mozilla Firebird extensions in your own profile folder instead of in the actual program folder (Profile Chrome). This means that you will be able to upgrade to new versions of Mozilla Firebird without losing all your extensions. Note that it's up to the extension authors to allow their extensions to use this functionality. Some extensions may not offer this as an option yet." Profile Chrome will make things easier and time-saving if you are a nightlies-addict.
Other new features introduced include Smooth Scrolling. As in Internet Explorer, Smooth Scrolling totally breaks the behaviour of your up/down keys, page up/down keys and your scrollwheel and is a Feature Made To Be Switched OffTM.