Rated 5 out of 5 stars

Great tool but not compatibel anymore with Thunderbird 60!

I found a other solution in the Thunderbird forum and this solution works well!

If you are using the AddOn "Provider for Google Calendar", you can add your TaskList also to thunderbird.
Add a new calendar and selekt Tasks!

Enjoy

Rated 5 out of 5 stars

Great tool!
Please make it compatible with firefox V60!

Thank you and Greetings from Austria
Rainer

Rated 5 out of 5 stars

-Go to the Google Tasks Sync Settings
-Select the checkbox "Clear local data and authentication..."
-restart Thunderird
-add your login data again

This solution helps by all of my installations

Rated 4 out of 5 stars

Since the Last two updates from Thunderbird the Add-On did not sync any more.
It would be great when the developer can fix that bug!
Thanks Rainer

I just tried on 45.5 on Windows and Linux and it worked in both cases. Try creating a new Thunderbird profile and installing the add-on there.