You can also use AMO to find add-ons for Mozilla %(startTBLink)sThunderbird%(endTBLink)s and %(startSMLink)sSeaMonkey%(endSMLink)s.
Yatikïr nawokisaj chuqa' ri AMO richin ye'akanoj taq tz'aqat richin Mozilla %(startTBLink)sThunderbird%(endTBLink)s chuqa' %(startSMLink)sSeaMonkey%(endSMLink)s.