[Bug 1981163]

[H-tb]

And yes, in my case PDFs opened to FireFox. I did not test or try to use
other PDF-viewers, if that has been a problem for some.

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https://bugs.launchpad.net/bugs/1981163

Title:
  [upstream] In Compose window, if a PDf is joined and clicked to open,
  Thunderbird launches Firefox instead of Evince

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