Comment 8 for bug 1981163

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In , 9-henry (9-henry) wrote :

Note: The patch for bug 1734428 fixes the case where the user has opted to view pdfs within Thunderbird and they still have a 3pane window open.

In other cases, this bug will still be seen (error in console, and treated as a `text/html` instead of `application/pdf`). E.g. if you choose to view pdfs using your system document viewer, or if you only have open a single composition window.