Исправление runtime, (текущая версия) :
Взято с support.mozilla.org:
Due to a certificate issue, add-ons are not working and will fail to install. We are currently working on this issue and you can track updates at https://discourse.mozilla.org/t/certificate-issue-causing-add-ons-to-be-disab...
Исходная версия runtime, :
Взято с support.mozilla.com:
Due to a certificate issue, add-ons are not working and will fail to install. We are currently working on this issue and you can track updates at https://discourse.mozilla.org/t/certificate-issue-causing-add-ons-to-be-disab...