Bugzilla is a general-purpose bug-tracking tool originally developed and used by the Mozilla Foundation. Since Bugzilla is web-based and can be considered both free software and open-source software, it is also the bug tracking tool of choice for many projects, both open source and proprietary.

Bugzilla relies on an installed web server, such as Apache, and a database management system, such as MySQL or PostgreSQL, to perform its work. Bugs can be submitted by anybody, and will be assigned to a particular developer. Various status updates for each bug are allowed, together with user notes and bug examples.

Bugzilla's notion of a bug is very general; for instance, mozilla.org uses it to track feature requests as well.

Release notes such as those for Bugzilla 2.20.1 indicate the exact set of dependencies, which include:

• A compatible database server (often a version of MySQL)
• A suitable release of Perl 5
• An assortment of Perl modules
• A compatible web server such as Apache or IIS (though any web server that supports CGI can work)
• A suitable mail transfer agent such as Sendmail, qmail, Postfix, Exim or any SMTP server

• Comparison of ticket-tracking systems

• Bugzilla Home Page
• Bugzilla Live Demo
• Step-By-Step Bugzilla Installation On Windows
• Mozilla.org's Bugzilla Installation
• Open Directory - Bug Tracking Software
• Wiki on Modifying Bugzilla
• Bugzilla Installation List Tops 400
• Bugzilla/CVS/Wiki integration
• Bugzilla/SVN/Wiki integration
• Bugzilla/JIRA conversion