Mozilla Public License
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.
MPL 2.0 FAQ - Mozilla
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
Public domain. This is the most permissive type of software license. When software is in the public domain, anyone can modify and use the software without any restrictions. But you should always make sure it's secure before adding it to your own codebase.
5 types of software licenses you need to understand | Synopsys