Examine source code of Rage - 21

{
  "theme": {
    "images": {
      "theme_frame": "Rageheader21.jpg"
    },
    "colors": {
      "frame": "#fac8c8",
      "tab_background_text": "#fac8c8"
    }
  },
  "version": "2.0",
  "name": "Rage - 21",
  "manifest_version": 2
}