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This is getting on my nerves - for some reason Firefox 4 is ignoring my mouse scrollwheel input. In other words, rolling the scrollwheel does nothing in Firefox 4.

It works fine in just about every other application. Any ideas what I can do to fix this?

Enabling/Disabling Smooth Scroll & Autoscroll ( and the various permutations of the two settings) seem to have no effect.

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Ridiculous. I just typed in the question and the scroll wheel started working :\ – Sathya Apr 28 '11 at 4:05
I think it might have to do with where the focus is within the window. Flash animations are bad for stealing focus. – RobotHumans Apr 28 '11 at 12:23
@aking1012 - agree with the focus, but I don't have Flash installed (yet). This is a mint fresh Windows desktop, FF just installed, no addons as well – Sathya Apr 28 '11 at 12:37

I have this happen from time to time, but clicking on another window and then back to Firefox fixes it. I believe it is a focus issue as aking1012 mentions.

Here are some settings related to the scroll wheel which you could try. I also read elsewhere that the general.autoScroll setting in about:config should be set to true. Finally, based on this page, you could try setting mousewheel.emulate_at_wm_scroll to true.

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Interesting that the system reported by the user in the Mozilla Link that you referenced happens to be the same one that I use. – Sathya Apr 29 '11 at 3:27
up vote 0 down vote accepted

Turns out, Lenovo's mouse drivers and their mouse suite for "extended" features are really crappy. I cannot uninstall them, but can unload them & doing so fixed this.

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Actually, turns out you pretty much CAN uninstall the mouse drivers, which will both solve the problem and not cause any long-running issues. (Uninstalled Lenovo Mouse Suite from under Programs and Features and the scroll-wheel seems to be working just fine now) – Priidu Neemre Feb 7 '15 at 7:49

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