These Add-on policies will become effective on December 2, 2019. You can read the current policies here.
Add-on Policies from 2019-12
All add-ons are subject to these policies, regardless of how they are distributed. When an add-on is given human review or otherwise assessed by Mozilla, these policies act as guiding principles for those reviews. Add-ons that do not comply with these policies may be rejected or disabled by Mozilla. Therefore, follow these policies when making add-on design and development decisions.