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Attachments in latest version of Thunderbird (91.2.0)

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Whenever I click on a PDF attachment that is in an email, the pdf opens in a tab instead of my default viewer. How do I go back to using the default viewer?

Whenever I click on a PDF attachment that is in an email, the pdf opens in a tab instead of my default viewer. How do I go back to using the default viewer?

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Preferences/General/Files & Attachments, click the Action drop-down and choose the default or any other app (see picture).