Rated 4 out of 5 stars

Great extension that worked very well up to TB 115 but no longer works with version TB 115.2.0

This review is for a previous version of the add-on (1.6). 

Hello,
It should work even after the update, at least it works here.
Try to uninstall it, restart Thunderbird and install it back. That could fix the issue.
Best Regards,
Juraj Mäsiar