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This stopped working for me after several months and was impossible to get it running again. Does this mean that this program is no longer?

Questa recensione riguarda una versione precedente (0.8.6.2) del componente aggiuntivo. 

There is new version, adapted to changes in the Thunderbird.
Currently it is stuck in the review queue, since August 1, 2017. It will be published as soon as someone do the review and allow it to be published.