Usually it is pretty simple to install a new language ( dictionnary) in Thunderbird.
FOr I don't know which reason, I can't install the french dictionnary onto Elvie's THunderbird version
Could someone try ?
JF
Do you really mean the dictionary,
or
Thunderbird in French as a whole?
For installing the dictionary
follow the Mozilla instructions
'manually installation of a .xpi file'
(free Translation 
)
Old post sorry SOLVED
yep .xpi file
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