Release Notes: This release candidate should be stable enough for production use. New features include simple bug filing, a new home page, hiding of email addresses from logged-out users, shorter search URLs, asynchronous email sending, display of dates and times in the user's time zone, custom fields that only appear when another field has a particular value, custom fields whose list of values change depending on the value of another field, the new custom bug ID field type, the "see also" field, the ability to reorder columns in search results, and search descriptions.
Release Notes: The new features in this major release include migration from other bug tracking systems, a simple "Browse" interface for browsing open bugs in a system, some usability improvements resulting from a scientific usability study conducted on Bugzilla, and the ability to have drop-in, easy-to-write Extensions that enhance Bugzilla's functionality.
Release Notes: This release candidate has received QA testing, and should be considerably more stable than the development releases before it. It is still not considered fully stable, and so you should understand that if you use it, you use it at your own risk. It includes Release Notes and a listing of New Features.
Release Notes: This release contains various useful bugfixes and security improvements.
Release Notes: This unstable development release contains one security fix and several new features.
Release Notes: This release fixes one security issue and a few minor bugs.