Thunderbird issues after updating Avast Antivirus

Issue: There are reported issues with Thunderbird, after a recent update to Avast antivirus software.
Who is impacted? Thunderbird users who recently updated their Avast antivirus software.
Why is this happening? A recent Avast update, seems to cause problems when it scans the Thunderbird Profile folder. For more information, see this post in the official Thunderbird Support forums.

What should I do?

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