Benvingut a complements de Thunderbird.
Add extra features and styles to make Thunderbird your own.
TancaBritish English Dictionary 1.19.1.2webext
per Mark Tyndall
British English Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey by David Bartlett.
To enable, right-click in a multi-line text box, select "Languages", then "English / United Kingdom".