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Worked once, and never again. Have tried all sorts-of stuff to get it working again; unfortunately it hasn't. I really liked it the one time it worked.

Это отзыв для предыдущей версии этого дополнения (1.2.1). 

Hello,

Thank you for you review.
What do you mean exactly ? Could you give me more details ?

Is the button disabled ? Has it disappeared ?
If you still can press the button, please give me back the errors (Tools/Error console).
What version of Thunderbird and this addon are you running ?