Examine source code of Girl Genius

{
  "theme": {
    "images": {
      "theme_frame": "ggboyspersona1.JPG"
    },
    "colors": {
      "frame": "#360f0f",
      "tab_background_text": "#bd1818"
    }
  },
  "version": "2.0",
  "name": "Girl Genius",
  "manifest_version": 2,
  "description": "Gilgamesh and Tarvek carefully extracted from one of the free wallpapers at Girl Genius. Check out the webcomic if you haven't heard of it!!"
}