It sounds like something in the upgrade from thunderbird 68.X (in focal)
to version 78.Y (in groovy) is possibly making thunderbird automatically
download language pack updates from the extensions site, that shadow the
ones that are installed system-wide. This would happen the first time
thunderbird is run after the update, which explains why it runs okay
once and fails afterwards.

This is just an hypothesis that needs to be confirmed.

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https://bugs.launchpad.net/bugs/1901829

Title:
  thunderbird fails to open, xml parse error

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