Mozilla Firefox 1.5.0.5 was released today. This update was released mainly for stability improvements and security fixes. A list of known vulnerabilities fixed with this updated version of Firefox can be found at Mozilla by clicking here. From the Mozilla Developer DevNews:
As part of Mozilla Corporation’s ongoing stability and security update process, Firefox 1.5.0.5 is now available for Windows, Mac, and Linux for free download from getfirefox.com. We strongly recommend that all users upgrade to this latest release. This update is available immediately in 39 languages including German, French, Spanish, Japanese, Simplified and Traditional Chinese, Korean, and more.
For more information, please see the Firefox 1.5.0.5 Release Notes.