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Since Mac upgrade to Sierra, can't turn off notifications via System Preferences

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I upgraded to High Sierra recently and since then, Thunderbird has been driving me mad with popup notifications. I went to Thunderbird's Preferences->General but a notice there pointed me use System Preferences -> Notifications. There I unchecked all the boxes, as seen in the screenshot, but they notifications still keep coming. I would rather not use the "Do Not Disturb" option to turn off all notifications, because I would like to keep calendar alerts.

Thunderbird v52.8.0 (64-bit) MacOS v10.13.4 (17E199)

Is there a fix for this? Thanks for your help!

I upgraded to High Sierra recently and since then, Thunderbird has been driving me mad with popup notifications. I went to Thunderbird's Preferences->General but a notice there pointed me use System Preferences -> Notifications. There I unchecked all the boxes, as seen in the screenshot, but they notifications still keep coming. I would rather not use the "Do Not Disturb" option to turn off all notifications, because I would like to keep calendar alerts. Thunderbird v52.8.0 (64-bit) MacOS v10.13.4 (17E199) Is there a fix for this? Thanks for your help!
Attached screenshots

All Replies (1)

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The last mac user that had this issue found it was their mac issuing the alert. If you turned it off in Thunderbird it is off.