Comment 6 for bug 1607240

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Daniel van Vugt (vanvugt) wrote : Re: Xmir Firefox scrolling is too fast (mouse wheel) when run under Unity8 (since Xmir 2:1.18.4-1ubuntu4)

Found the solution!

System Settings > Mouse & Touchpad >
Slide the second (unlabelled) slider all the way left, and then one notch right.

Turns out that unlabelled slider is the wheel scroll speed. Setting it one notch from the left correctly reduces the wheel speed from 7.0 to 1.0 as Mir clients expect.