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2010 MacBook Pro restarts when opening Thunderbird

Thunderbird App crash
Night worker
Night worker

Using 2010 MacBook Pro laptop, and os 10.12.6 Sierra. Apple no longer updates OS. When I open Thunderbird (version 60.9.0) it restarts the Mac. It usually takes three restarts for Thunderbird and Mac to "get along with each other". Why does the Mac shut down and restart only with Thunderbird ?

Using 2010 MacBook Pro laptop, and os 10.12.6 Sierra. Apple no longer updates OS. When I open Thunderbird (version 60.9.0) it restarts the Mac. It usually takes three restarts for Thunderbird and Mac to "get along with each other". Why does the Mac shut down and restart only with Thunderbird ?

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