It just hit me that you said this was in Firefox Options. If you can tell me how you're navigating to where the problem occurs, and what you're searching for, that would be helpful.
Brian - Windows 10 Home, 64-Bit, Version 1803, Build 17134
A great deal of intelligence can be invested in ignorance when the need for illusion is deep.
~ Saul Bellow, To Jerusalem and Back