Some of the new features include:
- A powerful new download manager that makes tracking multiple downloads easier
- Numerous improvements to bookmarks handling, making it easier than ever to keep track of your favorite sites
- Improved handling of extensions - small, easy to download applications that can be installed with a few simple mouse clicks and extend the browsers functionality.Community members have created more than 200 such extensions, including add-ons that remove ad banners, add spell-checker functionality, and add the ability to search Amazon.com, eBay or other popular sites from the Firefox toolbar;
- An easy to use installer for Microsoft Windows users
- A new default theme for Mac OS X users that integrates seamlessly with the OS X desktop environment.
Thunderbird misses an name change but now goes to updates to 0.5.