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British English Dictionary (Updated) 1.19.6 No Restart
This is an updated version of Mark Tyndall's extension. It packages David Bartlett's British English Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey.
About this Add-on
To enable, right-click in a multi-line text box, select "Languages", then "English / United Kingdom".
(This is an updated version of Mark Tyndall's British English Dictionary extension made to work with the latest Firefox, Thunderbird and SeaMonkey releases)