https://getsatisfaction.com/mozilla_messaging/topics/how_set_default_calendar_for_new_events_in_lightning Edited version Open Tools > Options > Advanced tab, and click Config Editor button. In the "Filter:" box enter "calendar.registry" Find a .calendar-main-default key - it will be set to true Other calendars either won't have a .calendar-main-default key (or it will be set to false) Right click on the value of the .calendar-main-default key that goes with the calendar that currently shows up by default in new events to toggle the value to false Click on the .calendar-main-in-composite key that goes with the calendar you want as default Right click on the same key and choose Copy Name from the menu that appears. Now right click on the key again and select New > Boolean Paste the name of the key and Use the backspace key to erase "in-composite" and type "default" Click OK and Choose true and click OK Now exit out of
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