Incoming attachments
Incoming attachments used to open in the appropriate app. Now the PDFs are opening in Tbird. How do I get them to open in Acrobat Reader again? (The Configure Attachments option doesn't seem to exist in the current Tbird.)
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At the top right of the Thunderbird window, click the menu button > Preferences > General > Files & Attachments Locate the entry for Content Type 'Portable Document Format (pdf)'. Select the desired Action for PDF from the drop-down menu.