OpticAmber is a dark background theme with high contrast amber text that's easy on the eyes and great for navigating tabs and…OpticAmber is a dark background theme with high contrast amber text that's easy on the eyes and great for navigating tabs and bookmarks. The 'active tab' features a bright header bar that can stand out in a sea of tabs and the low contrast geometric background and subtle ribbed toolbar add to the finish without distracting from the content. Also available: OpticGreen, OpticRed, OpticBlue, OpticWhite.