MDN’s new design is in Beta! A sneak peek:

Type: boolean
Can be set to enable or disable smooth scrolling for the corresponding arrowscrollbox. If not set explicitly, it will fall back to the smoothscroll attribute and then to the toolkit.scrollbox.smoothScroll preference. Currently, smooth scrolling supports horizontal arrowscrollboxes only.

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 Contributors to this page: Sheppy, trevorh, Marsf, Dao
 Last updated by: Sheppy,