Support for Thunderbird 60+ #35
Description
Due to significant changes imposed on Thunderbird, version 60 will not automatically load an add-on unless it has been marked compatible by the author [...] If your add-on is not compatible, please contact the author at their support website or email, which you can find on the add-ons website.
Source: https://support.mozilla.org/en-US/kb/new-thunderbird-60#w_some-add-ons-may-not-work