TB won't open even though Task Manager says its running. Why?

Windows 8.1.
TB worked fine 'til few days ago.
Now it won't open even though Task Manager indicates it's running.

It is possible that your security software (firewall, anti-virus) blocks or restricts Thunderbird without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Thunderbird and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full, unrestricted, access to internet for Thunderbird.
*https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating

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