Currently Google Tasks entries can´t be displayed in Thunderbird calendar.It would be nice if it would be possible to show Google Tasks in Thunderbird calendar.
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Tasks are supported when using the provider for Google calendar. The add-on accesses the calendar using a different method to Thunderbird native caldav, so the tasks are made available.
Provider for google calendar does not work with supernova version.So for the newest version I don't know any solution for having google tasks in TB. I used to organize myself with the tasks in google to be synchonized everywhere, thanks!!!!