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Custom Alarms 0.5 Requires Restart
Customize the reminder dropdown in Sunbird and Lightning's event and task dialog.
To configure this extension, open the addon preferences from the addons manager.
This add-on has been marked as experimental by its developers
This add-on is not compatible with your version of Thunderbird because of the following:
About this Add-on
Then you can open the event or task dialog and will see your previously selected alarms in the reminder dropdown.