Rated 4 out of 5 stars

per RainerP el nov. 29, 2016 ·

Since the Last two updates from Thunderbird the Add-On did not sync any more.
It would be great when the developer can fix that bug!
Thanks Rainer

per Tomasz Lewoc (desenvolupador) a des. 17, 2016 ·

I just tried on 45.5 on Windows and Linux and it worked in both cases. Try creating a new Thunderbird profile and installing the add-on there.