When Chrome came along they decided to go in a different direction entirely slowly making it more and more painful to accomplish what used to be easy in the name of security. The review process went from automatic if you were trusted to weeks and then months and then more than a quarter year. They started demanding source code. It became scary to release to addons.mozilla.org because you never knew how long it would be before your next release would be approved.
Mozilla needs to realize they're hastening their own demise - Chrome now offers better features than when Mozilla was the leader including releasing to a percentage of users and faster nearly invisible to the user updates. They should go back to their roots and embrace developers again.