Examine source code of CF Purple Clouds

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#240d3d",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "CF Purple Clouds",
  "manifest_version": 2,
  "description": "Beautiful, retro 16-bit purple clouds that remind you of the friends you've made along the years.\n\nNOTE: This theme works best with the Menu Bar enabled."
}