[Bug 1945741]

[Rob Lemley]

Thunderbird 91.3.1:
https://hg.mozilla.org/releases/comm-esr91/rev/42ba83eea3e4
https://hg.mozilla.org/releases/comm-esr91/rev/b591bbdc0544

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https://bugs.launchpad.net/bugs/1945741

Title:
  [upstream] PDF attachment opens in Firefox instead of the built-in
  viewer when opened from the compose window

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