http://lemdro.id/ ?

It shows it in German for me on lemm.ee

I have no idea, I’m not a mod here and I don’t remember seeing that thread.

Modlog says: Rule 2 - use !askandroid for technical support please

!askandroid@lemdro.id

Probably same reason as here: https://lemm.ee/post/35007837

It’s not in the official F-droid repo

https://mobileapp.bitwarden.com/fdroid/

Android roadmap: https://developer.thunderbird.net/planning/android-roadmap

Out of all of them Iceraven has been my favorite simply because of its support for desktop extensions.

You can use more extensions on other ones as well:

https://blog.mozilla.org/addons/2020/09/29/expanded-extension-support-in-firefox-for-android-nightly/

Works on Firefox Beta, Firefox Nightly, Fennec and Mull.