Welcome to Firefox for Android Add-ons.
Add extra features and styles to make Firefox for Android your own.
CloseReview for Show InOut by Anon99687454101
Rated 4 out of 5 stars
This add-on seems to do exactly what I am searching for, but why does it require "full, unrestricted access to Thunderbird, and your computer"?
Deal-breaker for me, unless there is a pretty good reason.
Edit: thanks for your fast answer. I may reconsider.
Please read https://support.mozilla.org/en-US/kb/permission-request-messages-thunderbird-extensions#w_have-full-unrestricted-access-to-thunderbird-and-your-computer
To create your own collections, you must have a Mozilla Add-ons account.