Section 3.3 of the Mozilla Public License:
3.3. Distribution of a Larger Work
You may create and distribute a Larger Work under terms of Your choice, provided that You also comply with the requirements of this License for the Covered Software. If the Larger Work is a combination of Covered Software with a work governed by one or more Secondary Licenses, and the Covered Software is not Incompatible With Secondary Licenses, this License permits You to additionally distribute such Covered Software under the terms of such Secondary License(s), so that the recipient of the Larger Work may, at their option, further distribute the Covered Software under the terms of either this License or such Secondary License(s).
The Free Software Foundation makes this comment:
It's important to understand that the condition to distribute files under the MPL's terms only applies to the party that first creates and distributes the Larger Work. If it applied to their recipients as well, it would be a further restriction and incompatible with the GPL and AGPL.
Does this mean that the recipients of a Larger Work which is not under Secondary Licenses can freely violate the MPL's terms for the MPL-covered files, such as removing copyright notices or combining proprietary code with MPL code in the same file, and distribute the program as if the MPL had never been applied?