[Bug 1228250]

[Masayuki]

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

https://reviewboard.mozilla.org/r/186794/#review193228

> Oh, modifier in the JS object isn't about the event but about the
pref. Could you document that somewhere

I'll rename it instead of documenting it.

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

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