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Re:Firefox: Announcing Project Mortar by jhatax on Sunday October 02, 2016 @12:04PM (#12622925)
Try this: Preview -> View -> Continuous Scroll.

It did the trick for me on macOS Sierra.

YMMV

Re:Firefox: Announcing Project Mortar by lalalander on Monday October 03, 2016 @01:44PM (#12629606)
I'll give this a try when I finally upgrade to Sierra. Thanks!