The Mozilla.org announcement says:
Mozilla 1.4 Beta Released
Mozilla 1.4 Beta is out. This release includes support for NTLM authentication, usability improvements, and lots of performance, stability, and site compatibility fixes. More information is available in the release notes.
The Mozilla 1.3.1 release is also available over at Mozilla.org.
This follow-up to Mozilla 1.3 restores XPInstall functionality for Mac OS X users.
[anything else I should do for this announcement?]
UserAgent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.4b) Gecko/20030427



