[Bug 1945741]

[Vseerror]

Comment on attachment 9245693
Bug 1734428 - handle open pdf attachment during composition using pdf.js if wanted. r=henry

[Triage Comment]
Approved for beta

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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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