[Bug 1228250]

[Masayuki]

(In reply to public from comment #128)
> This add-on can be used until Firefox 58 has been released: Shift + Scroll
> (Horizontal Scrolling) -
> https://addons.mozilla.org/en-US/firefox/addon/shift-scroll/

Firefox 56 and earlier, it can be implemented by XUL addons, but Gecko
58+ has this feature. So, only with Firefox 57, you cannot use this
feature.

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

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

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