* [Thunderbird Conversations v4.3.16](https://github.com/thunderbird-conversations/thunderbird-conversations) – Extension enhancing email thread summaries with inline replies and Gmail-style conversation features.

* [ThunderAI v5.0.4](https://github.com/micz/ThunderAI) – Thunderbird addon enhancing email management with AI-powered analysis, writing assistance, tagging, and task creation.

* [TbSync v5.3.8](https://github.com/jobisoft/TbSync) – Thunderbird add-on providing a central UI to manage cloud accounts and synchronize contacts, tasks, and calendar data while simplifying account setup.

* [Thunderbird User.JS v140.3](https://github.com/HorlogeSkynet/thunderbird-user.js) – Thunderbird user.js template providing privacy, security, and anti-fingerprinting settings while minimizing functionality loss in email-focused use.