[Bug 1228250]

[Masayuki]

Comment on attachment 8915954
Bug 143038 Make users can scroll contents horizontally with vertical wheel operation with a modifier

Review request updated; see interdiff:
https://reviewboard.mozilla.org/r/186794/diff/3-4/

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https://bugs.launchpad.net/bugs/1228250

Title:
  [Shift + Mouse-Scroll-Wheel] Does NOT Scroll Horizontally

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