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!