On Firefox add Midnight Lizard.
Never be plagued by stupid childish themes.
Midnight Lizard works best with a solid theme. With this add on, choose any color of the spectrum. In steps, apply to:
Module Headline Text
Scrollbars (width and color) Unfortunately this adjustment not available for Firefox
Also, any other site, visited or Favorite, you can retain its original colors by going to 'Activation' on the menu and uncheck "run on this website"...