Of late, websites have begun to style the scrollbars displayed inside Firefox. They try to change the width and color of the scrollbars. This usually makes the scrollbar hard to grab and drag with the mouse.
By default, Firefox uses the scrollbar style of your OS or windowing environment for its websites. Websites manipulate the scrollbar using the CSS properties
To take back control, open
about:config and set the following two settings to
Tried with: Firefox 69.0 and Windows 10