you're reading...

Fix for slow mouse-wheel scrolling in Firefox

After seeing it mentioned somewhere I decided to see if there was a configuration option in about:config for controlling the number of lines scrolled with the mouse wheel. Turns out there is.

Like IE, Firefox is pulling the number of lines from the OS; but it uses a different calculation to determine exactly how big a line is. If I open up IE and scroll my mouse one click down on Yahoo’s front page, the top of the window rests right under the line below the tabs for the search box. In Firefox it would stop right after the Yahoo banner at the top. A large difference even before you consider that when loaded in Firefox the tabs are replaced with a combobox to the right of the search text, so it has to scroll even further in IE than Firefox just to get to the textbox.

As I mentioned in the first paragraph the fix lies in about:config. Scroll down to the lines that read “mousewheel.withnokey”, change the one that ends with “sysnumlines” to false, and set the one that ends with “numlines” to the number you desire (the default is but the user can change the system value in the control panel). I chose 6. Now you should have nice fast scrolls once again, and my finger can begin to recoup after all the extra time I spent scrolling.


About James

I am a Senior Developer/Consultant for InfoPlanIT, LLC. I previously spent over 7 years as a Product Manager for what eventually became ComponentOne, a division of GrapeCity. While there, I helped to create ActiveReports 7, GrapeCity ActiveAnalysis, and Data Dynamics Reports.


No comments yet.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s


%d bloggers like this: