The current version of the license is MPL 1.1 (html | plain text). There is an annotated version to help you understand the license, and a FAQ to help you if you want to use or distribute code licensed under it.
We are currently updating the Mozilla Public License to version 2.0, and we would like your feedback. Please get involved!
New Source Code
Any new code checked into Mozilla's source repositories needs to comply with our source code licensing policy. Generally, this means using the Mozilla tri-license, which offers users the choice of the MPL, or the GNU Project's LGPL or GPL. Please use the appropriate license boilerplate text.
Existing Source Code
Some Mozilla projects have terms other than the MPL or tri-license. Detailed information on the licensing of our existing code can be found by inspecting the relevant source code, or by visiting the license information page in the relevant Mozilla software.
We have retained various historical documents relating to the Mozilla and Netscape Public Licenses.
Other Mozilla Licensing Information
Not everything Mozilla produces is made available under the MPL. For information on how other things are licensed, including our trademarks and websites, see our general licensing information page.