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Firefox scroll speed changes based on what input devices is used first

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I have two input devices, my laptop's Synaptics trackpad and a Logitech mouse.

When using Firefox with my mouse, pages scroll multiple lines at a time, like they should. If after starting Firefox I scroll with the trackpad, then switch back to my mouse, pages will scroll one line at a time. This persists until I close Firefox.

It's as if Firefox chooses the scrolling speed based on which input device it detects first. Can anyone offer some insight on this?

I have two input devices, my laptop's Synaptics trackpad and a Logitech mouse. When using Firefox with my mouse, pages scroll multiple lines at a time, like they should. If after starting Firefox I scroll with the trackpad, then switch back to my mouse, pages will scroll one line at a time. This persists until I close Firefox. It's as if Firefox chooses the scrolling speed based on which input device it detects first. Can anyone offer some insight on this?

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The problem seems to go away when rolling back to Synaptics' Windows XP touchpad driver (15.x). However, these older drivers are limited in functionality.