It's... Not? I'm on the drivers that work for windows 10, everything is fine, except sometimes I drag the trackpoint a little to the side instead of perfectly up and down and it horizontal scrolls instead of vertical.

The mouse is working as intended, I just firefox to stop accepting those inputs.

With a normal mouse you would have to press the Shift key to scroll horizontal and the issue that you have wouldn't occur. Apparently with your touchpad you can scroll in both directions. I don't know if there is a way to limit scrolling with a touchpad to only scroll vertically in Firefox.

• https://www.google.com/search?sa=N&num=100&q=touchpad%20disable%20horizontal%20scroll

There are no windows 10 drivers that work for it, it requires a very specific driver number to work properly (here for posterity). I'm not using a touchpad, it's a physical scroll button and a trackpoint which when I accidently drag sideways a little (very easy with a trackpoint) it scrolls to the side instead.

I found out how to disble it in windows 7. Regedit to HKEY_Current_USER\Control Panel\Desktop then set WheelScrollChars to 0, but predictably, this doesn't work in Windows 10.

What did finally work was this: [https://superuser.com/questions/16112.../preventing-unwanted-horizontal-scrolling-with-synaptics-ultranav-driver-thinkpa]

Summarised, it's not doing what I thought it was. It's sending left/right key events, for some reason. /shrug

Going to a text file tp4table.dat , located in C:\Program Files\Synaptics\SynTP and putting a ; to comment out the Firefox line fixes the problem.