New version for SeaMonkey on addons.thunderbird.net!
Full list of changes since 0.8:

v1.6 - February 27, 2021
*Support SeaMonkey 2.41+.

v1.5 - September 20, 2020
*Prevented missing 'control-container' failure.
*Minor code cleanup.

v1.4 - August 28, 2018
*Improved namespacing to prevent issues with ES6.
#Duplicated Ukrainian localization for uk-UA.

v1.2 - March 27, 2018
*Corrected icon paradigm.

v1.1 - January 21, 2018
*Fixed compatibility with "Addons Manager Hilite".

v0.9.1 - November 16, 2017
+Added locale for Indonesian. Thank you BabelZilla.org.

Fixed an issue with Firefox 44 and above due to the "let" js change.

Added PaleMoon target application entry.
Added Public Domain notice to source files.
Upped version compatibility numbers.

#Rewrote system for all versions again, this time using css and xml binding. Thank you Add-on Compatibility Reporter for example code on how to achieve this cleanly.

#Rewrote system for all versions to use simple XML replacement.

#Standardized all locales according to official Mozilla listings.
+Added locales for Hungarian, Italian, Latvian, Portuguese (Portugal), Romanian, and Swedish.
+Added publish date to version number.

+Added locales for Danish, Spanish (Spain), French, Macedonian, and Russian. Thank you BabelZilla.org.

+Added locales for Arabic, Catalan, and Japanese. Thank you BabelZilla.org.