XF 2.2 How to get rid of bottom scroll bar in font drop-down in Firefox?

[imno007]

This might be a long shot, but I'm wondering if anyone can tell me how I might get rid of the bottom scroll bar here (in FF):




This is a result of me adding a couple extra fonts to the editor, but that bottom scroll bar only appears in Firefox (that I know of.) I tested it in Chrome and Edge and it doesn't appear in those browsers.