What's New in Firefox 1.5.0.1
February 1, 2006. Firefox 1.5.0.1 is a stability and security update that is part of our ongoing program to provide a safe Internet experience for our customers. We recommend that all users upgrade to this latest version.
Here's what's new in Firefox 1.5.0.1:
* Improved stability.
* Improved support for Mac OS X.
* International Domain Name support for Iceland (.is) is now enabled.
* Fixes for several memory leaks.
* Several security enhancements.
http://www.mozilla.com/firefox/releases/1.5.0.1.html 