The add-on is actually not only compatible with Firefox but also with the email client Thunderbird and other Mozilla based applications such as Seamonkey, Songbird or Flock. The extension will automatically change the mouse scrolling speed in the application it was installed in.

The options of the add-on provide access to very extensive parameters that can be used to fine tune the scroll speed. Available are both basic and advanced settings.Basic mode contains settings to change the speed and step size. Speed ranges from very slow to turbo while the step size ranges from 1/10 page to 1 page or 10 pixels to 500 pixels. It might take a few tries before the ideal scroll speed settings can be found but it is very well worth it in the long run.

Holding down the alt or shift key will increase or respectively decrease the scrolling step size to allow for a bigger or smaller scrolling area. Additional options are available in the basic settings window like enabling the same scrolling speed when using the computer keyboard to scroll. The advanced settings on the other hand can be configured to change adaptive duration and steps and a fps limit. SmoothWheel is a great add-on for users who are not satisfied with the mouse scrolling behavior of Firefox or other Mozilla software programs.