Thunderbird update: My calendar tab disappeared. Previous suggestions don't solve my problem!
Addons Manager says that Lightning incompatible with Thunderbird 60.3.3. The extensions.installed(blah.blah) does not exist in config editor. How to restore my calendar?
Chosen solution
Just updated, and my calendar has been restored. Thank you Mozilla support.
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Just updated, and my calendar has been restored. Thank you Mozilla support.