Thunderbird in macOS - icon not displaying a count of new mail

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Simon Sheppard
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Thunderbird in macOS - icon not displaying a count of new mail

Post by Simon Sheppard »

This took far too long to figure out, so I'm leaving the fix here in case someone else finds it useful.

In Thunderbird Settings, select the 'general' cogwheel.
Scroll down to the bottom and click on 'Config Editor'

search for "mail.biff"

Set
mail.biff.show_alert = TRUE
mail.biff.use_new_count_in_badge = TRUE
Not sure if both of these are needed, but this is what worked. Double-click to toggle the values.

Restart Thunderbird

Thunderbird should now show in System Preferences > Notifications
and you will get a new mail icon badge when new mail arrives.
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