See it here on mozillazine.org

http://www.mozillazine.org/talkback.html?article=3110

or just read the article here

http://www.mozilla.org/roadmap/branding.html

it is by Christopher Blizzard. The key points are

>>>>>>>>

3. When referring to Thunderbird or Firebird before or during the 1.4
release cycle, make sure to use the project name with Mozilla pre-pended
as "Mozilla Thunderbird" or "Mozilla Firebird" instead of Mozilla alone
or Firebird/Thunderbird alone.

After the release of 1.4 we will be doing our primary development on the
Firebird and Thunderbird projects. When we do releases of that codebase
we should be using self-descriptive brand identities for the public and
the press. New rule:

4. Use the names "Mozilla Browser" and "Mozilla Mail" to describe the
Firebird and Thunderbird projects after the 1.4 release.

Also, this branding should be found throughout the projects if possible
instead of referring to the Firebird and Thunderbird names directly.
Project names are transitory. As long as we have both a mail and
browser project, we should be using the Mozilla brand and reinforcing it
whenever we get the chance.
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David Warnock, Sundayta Ltd. http://www.sundayta.com
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