I wanted to know how much a user uses scrollbar buttons rather than the thumb? and possible cases when he goes for buttons?

1 Answer 1


I have found a heat map study from mozilla ui lab for the firefox browser. It's visualize the user behavior clearly.

Mozilla UI lab heat map study

Based on over 117,000 Windows 7 and Vista Test Pilot submissions from 7 days in July 2010

  • The Up arrow on the scrollbar was used on average by 27% of users.

  • The Down arrow was used on average by 33% of users.

  • 95% of users drag the vertical scrollbar

Here are some more descriptions about this study

  • I'm amazed by these figures over using the scroll wheel. Is there any indication of how much scrolling was involved in the page? I tend to find users use scrollbar dragging when they need to go a 'long way' and the scroll wheel when they want to slowly scan the page at reading pace
    – TJH
    Aug 31, 2012 at 9:00
  • Sorry, I can't find any details in the study...
    – sysscore
    Aug 31, 2012 at 9:17
  • Sorry, didn't expect you to go looking. Link is really useful, thanks for posting. +1
    – TJH
    Aug 31, 2012 at 9:31

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