Is MPL License Free?
The Mozilla Public License (MPL) is a free and open-source software license developed and maintained by the Mozilla Foundation.
The MIT License is a permissive free software license originating at the Massachusetts Institute of Technology (MIT) in the late 1980s. As a permissive license, it puts only very limited restriction on reuse and has, therefore, high license compatibility.
MIT License - Wikipedia
Is Mozilla Public License free?
Mozilla is the custodian of the Mozilla Public License ("MPL"), an open source/free software license. The current version of the license is MPL 2.0 (html | plain text).
Mozilla Public Licence
Is MPL free for commercial use?
Nothing. Like all other free and open source software, software available under the MPL is available for anyone (including individuals and companies) to use for any purpose. The MPL only creates obligations for you if you want to distribute the software outside your organization.
MPL 2.0 FAQ - Mozilla