This is easy in windows:

1. hit start orb
2. type mouse wheel
3. hit first option
4. set the mouse scroll rate

However, settings in Linux desktops such as GNOME and KDE does not directly set the scroll speed in Firefox:

1. type about:config in Firefox address bar and hit enter
2. make the following changes

• mousewheel.withnokey.sysnumlines->”false”
• mousewheel.withnokey.numlines -> 6 (default:3)

Scroll to see the changes

1. go to about:config in the address bar
2. right click to create a new integer entry
3. set network.dnsCacheExpiration to 3600
4. set network.dnsCacheEntries to 1000

Notes:

1. about about