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.
Wakami ri taq rutz'aqat Thunderbird chuqa' SeaMonkey xtiq'alajin pa addons.thunderbird.net. Yatikïr nawokisaj ri rub'i' taqoya'l richin ye'ak'ëx pa ri k'ak'a' ajk'amaya'l ruxaq.