Benvingut a complements de Thunderbird.
Add extra features and styles to make Thunderbird your own.
TancaQuant al complement
Also, this addon is compatible with e.g. TB 52 ESR and other versions up to TB57 - use version 64.3 from the archive.
It is beyond me why this addon shows as incompatible with TB52 ESR when there is clearly one version available!