Review for Seazilla by Zanqeutil
Rated 4 out of 5 stars
It worked with Seamonkey 2.9.1 but after the automatic update Seamonkey 2.10 disabled Seazilla 2.4 and it could not be enabled. I installed Disable Add-on Compatibility Checks 1.3 and Seazilla works again.
https://addons.mozilla.org/en-us/thunderbird/addon/checkcompatibility/
In Composer the print button icon is badly distorted, everything else looks and works fine.
Zanqeutil
To create your own collections, you must have a Mozilla Add-ons account.