This extension is intended for two purposes: entertainment and redistributing Firefox, SeaMonkey or Thunderbird within your organization.
Under no circumstances should this extension be bundled with Firefox or Thunderbird and delivered to another individual unless that individual is within your organization.
If you want more information, you can consult the Mozilla Foundation Trademark Policy at http://www.mozilla.org/foundation/trademarks/
In addition, it should be noted that this extension does not completely rebrand on Mac. The application title in the menu bar cannot be changed from an extension.
If you have a specific need to rebrand Firefox or Thunderbird and ship it (including Mac), please contact Kaply Consulting at http://consulting.kaply.com. We specialize in that.