[Bug 1228250]

[U583025]

Why not merge code from this add-on (https://addons.mozilla.org/en-US/firefox/addon/shift-scroll/) be merged into upstream Firefox?
Should be easy to fix such a long standing bug.

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

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

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