Add-ons for Thunderbird and SeaMonkey are now listed and maintained on addons.thunderbird.net. You can use the same account to update your add-ons on the new site.
Izegrar i Thunderbird akked SeaMonkey llan tura, daɣen ttwaseggmen deg izegrar di  addons.thunderbird.net. Tzemreḍ ad tesqedceḍ yiwen umiḍan i uleqqem n yizegrar-ik deg usmel amaynut.