Rated 5 out of 5 stars

Very useful add-on. I had a few problems with the integration of LanguageTool, but they were quickly solved by the man behind this project:
https://gitlab.com/florent_tassy/whatsapp-web-in-thunderbird/-/issues/9

This review is for a previous version of the add-on (1.3.1). 

Thank you for the excellent rating, comment, and thank you for reporting this issue on GitLab and helping me to troubleshoot it :-)