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For everyone out there not sure what to do with the xpi file downloaded via Happy One's link: I opened up Add-ons in Thunderbird, removed the old version, and then just dragged the new xpi file into the Add-ons box. Worked for me with ver. 52.5.2 on Win10

Это отзыв для предыдущей версии этого дополнения (62.0).