There isnt a list of the ‘best practices’ but there are practices that can help.
https://discourse.mozilla-community.org/t/review-queue-progress-and-the-v41-release/4018/7
https://discourse.mozilla-community.org/t/extension-approval/6665/5
https://discourse.mozilla-community.org/t/quite-slow-que/13714
https://discourse.mozilla-community.org/t/your-review-process-is-hurting-companies/14849