Rated 3 out of 5 stars

It seems to detect the duplicated message. But as a previous reviewer pointed out, I can't find the preference menu in either Thunderbird/Preference nor in Toos/Add-on Preference.

TB 68.3.0 in macOS 10.13.6

Αυτή η αξιολόγηση γράφτηκε για παλιότερη έκδοση του πρόσθετου (1.5).