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Thunderbord 6.0Addon creates an error:Could not read chrome manifest file 'C:\Users\Keith\AppData\Roaming\Thunderbird\Profiles\odiyafc6.default\extensions\en-GB@dictionaries.addons.mozilla.org\chrome.manifest'.Have reinstalled several times and disabled all other addons. This is my only error

Questa recensione riguarda una versione precedente (1.19.1) del componente aggiuntivo. 

This sounds like the add-on file has become corrupted. You don't say if you're re-downloading the add-on each time. If not, please try a fresh download. Otherwise, please try installing into a new profile (see http://support.mozillamessaging.com/en-US/home if you need help with that).