Find PDF in the list and change it to the desired value.

In the General panel, go down to the Applications section.

Alternatively, enter about:preferences in the address bar.

Click the hamburger menu button and choose “Preferences”.

Here is how to disable the built-in PDF viewer or use the system viewer: If you don’t want to downgrade your Firefox browser but still want to try a different version, try using Firefox ESR (Extended Support Release). The built-in PDF viewer in Firefox has progressed continuously since its introduction in 2013, but I still prefer using the distribution’s document viewer (Evince/Xreader/…). If you want to upgrade your Firefox later to the latest version, click on Restart to Update Firefox. Disable the built-in PDF reader in Firefox

mousewheel.system_scroll_override_on_root_Ģ.

There are a few more variables which influence the vertical scrolling speed and can be changed safely, for example: The acceleration computations create a constant acceleration effect, but this value can control the level of acceleration.

: The multiplicative factor used to determine the rate of acceleration.

Suggested values: 2 (accelerations kicks in really fast) to 5. This value determines whether or not acceleration computations are applied to a given scroll event.

: The mouse wheel “click” number at which acceleration begins to take effect.

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