[Bug 1945741]

[Mkmelin+mozilla]

Comment on attachment 9248426
Bug 1734428 - take2 - handle opening pdf attachments using pdf.js during composing email. r=henry

[Approval Request Comment]
Uplift for both patches.

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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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