Allow customization for menu buttons like in firefox

I really don’t like the look of all this button jargon, brave shield, brave wallet, etc. Even with all shield global settings disabled, it will appear bright orange on any new website (even though in this case it does nothing) and just sticks out like a sore thumb. The main reason I switched from Chrome was because of annoying features that cannot be disabled (autopredict, “sign in to google” pop ups, etc.) If this browser was just as modular as it is secure, it would be like the next firefox.