Developer reply by DW-dev
Rated 5 out of 5 stars
so we're constantly waiting for the new version "Account Colors 12.0" to be released and published here.
thanks
Account Colors 12.0 has been submitted to the Thunderbird team for review and release.
Unfortunately, it looks as if the review and release process will take longer than a few days.
Account Colors is currently at position 17 in the review queue and this has not changed for a couple of days.
To create your own collections, you must have a Mozilla Add-ons account.