Bug 1718947 Comment 5 Edit History

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The earlier versions did not have the PDF Viewer which opens the PDF in a tab like they do in Firefox.

Try changing the association to use your PDF application.

That works for me.
The earlier versions  of Thunderbird did not have the PDF Viewer which opens the PDF in a tab like they do in Firefox.

Try changing the association to use your PDF application.

That works for me.

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