Monterail Full Dark, a Thunderbird theme inspired by the mockup of Monterail
WARNING: the last version is only compatible with Thunderbird 78.x
This is a full theme for the Thunderbird e-mail client, inspired by Monterail mockup and by spymastermatt's dark theme. As opposed to the spymastermatt's version, this theme can be installed easily and quickly with an addon and it's compatible with Thunderbird 60.x and 78. The previously versions are compatible also with Thunderbird 68.
The first step is to download the theme, unzip the contents and re-create a zip only with the content of "monterail-fulldark" folder. Change the extension of the archive to ".xpi". An extensive guide for install the xpi file can be found here on the Mozilla support site, starting from "A slightly less ideal case". The Addon Manager can be found by clicking the menu icon (on the right, next to the search bar) followed by Add-ons and click on the Themes panel on the left.
The theme can be directly downloaded from the Thunderbird Add-on market, the old version can be found by searching "Monterail Full Dark" directly in the add-on page of thunderbird or there, the new version can be found by searching "Monterail Full Dark 2.0 for TB>68" directly in the add-on page of thunderbird or there.
Installation fail/Theme didn't change in Thunderbird 60
This seems a know issue of Thunderbird 60 [1] [2]. With this workaround it'll work:
C:\Users\[your windows user]\AppData\Roaming\Thunderbird\Profiles\[(literally) random letters and numbers].default/
/home/[your linux user]/.thunderbird/[(literally) random letters and numbers].default/
/home/[your macos user]/Library/Thunderbird/Profiles/[(literally) random letters and numbers].default/
The original Monterail version will be released?
Nope, it already exists: Monterail by Paenglab.
Yes. Currently the theme has been tested only on Windows 10 and openSUSE. You are free to open an issue here on GitHub if you find bugs.
Version 1.1.6 works with Thunderbird <=60.x. Version 2.1 works only with Thunderbird 68. The last versions works with Thunderbird 78.
This addon is based on Monterail by Paenglab, source code is included.
Special thanks to spymastermatt for the work that he done to create the original dark theme.