de rsjtdrjgfuzkfg (desarrollador) el Jun. 9, 2020 · enlace permanente

Any reasonable tray application should have an option to hide the window in the regular task bar while it is kept in the tray. I wasn't able to find a tray application named "Firebird", though – so I have no idea how to do that with your tool. Note that you do *not* need a tray application designed for Thunderbird – any application that permits to move minimized windows into the tray should work.

Upcoming versions of Thunderbird will also natively support minimizing to the tray (Windows-only for now) – if you enable the option in the settings, the add-on will thus natively move Thunderbird to the tray.

de rsjtdrjgfuzkfg (desarrollador) el Mayo 23, 2020 · enlace permanente

It is possible that you use an unsupported version of Thunderbird and/or there is another add-on conflicting with Minimize on Close. If you need help, contact the support email address with more details – the rating feature here is not designed for conversations.

de rsjtdrjgfuzkfg (desarrollador) el Abr. 26, 2020 · enlace permanente

For the future: don't use the rating feature to ask questions, write an email to the linked email address. The rating feature is not intended for support or other questions.

Minimize on Close still uses the old Add-on API (and will probably be ported as experiment to 78, which is similar to the old API), so yes that would be possible. But I don't think minimizing on startup belongs into an add-on named "Minimize on Close". If you or somebody else wants to implement a separate add-on to minimize on startup, feel free to take Minimize on Close as starting point, though. :)

de rsjtdrjgfuzkfg (desarrollador) el Abr. 26, 2020 · enlace permanente

This issue has been fixed in version 1.1.0.0, which is awaiting its review by the Thunderbird add-ons team since about a month now. If you don't want to wait for the review, you can download it at https://addons.thunderbird.net/thunderbird/downloads/file/1016729/minimize_on_close-1.1.0.0-tb.xpi