- Type about:config
in Firefox’s address bar
- Type: mousewheel.default.delta_multiplier_y
in the filter box
- Change mousewheel.default.delta_multiplier_y’s value to 200 if you want to double it. I use 400.
1. Type about:config
2. Optional Type: mousewheel.withnokey
3. Set mousewheel.withnokey.sysnumlines to false
This makes Firefox use its own setting instead of the system-wide setting. 4. Change mousewheel.withnokey.numlines to how many lines you want to scroll at a time.
I use 8