tl;dr: CVS & BZR (aka Bazaar) version control systems have been decommissioned at Mozilla. See https://ftp.mozilla.org/pub/mozilla.org/vcs-archive/README for final archives.

As part of our ongoing efforts to ensure that the services operated by Mozilla continue to meet the current needs of Mozilla, the following VCS systems have been decommissioned:

• cvs.mozilla.org via bug 985022
• bzr.mozilla.org via bug 967642

This work took coordinated effort between IT, Developer Services, and the remaining active users of those systems. Thanks to all of them for their contributions!

Final archives of the public repositories are currently available at https://ftp.mozilla.org/pub/mozilla.org/vcs-archive/. The README file has instructions for retrieval of non-public repositories.

NOTE: These URLs are subject to change, please refer back to this blog post for the up to date link.

For any questions or concerns, please contact the Developer Services team.

https://blog.mozilla.org/it/2015/07/28/vcs-decom-status/