Revert "Download, rather than opening, PDF attachments in Firefox (bug 1661259, PR 12286 follow-up)" #12326
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This reverts commit 2a0de0b.
I can no longer reproduce these issues locally, and if ad blockers are still interfering with this functionality we really ought to pursue a mozilla-central solution to the problem instead. (Also, I'm no longer getting an "Open with Firefox"-option in the "Open with"-dialog making the PDF attachments experience worse for all users.)