bởi hcl (Nhà phát triển) lúc Tháng 1. 5, 2022 · liên kết thường trực

On July 7, 2021 we exchanged e-mails and on July 8 we found the issue: there was an incompatibility with an old Thunderbird extension which was not compatible with Thunderbird new API and prevented the addition of new buttons. Disabling the extension solved the issue.