Examine source code of Cascade Knights

{
  "theme": {
    "images": {
      "theme_frame": "ffh.jpg"
    },
    "colors": {
      "frame": "#fafafa",
      "tab_background_text": "#0c240c"
    }
  },
  "version": "2.0",
  "name": "Cascade Knights",
  "manifest_version": 2,
  "description": "This is easier than I thought!"
}