Examine source code of Original Characters

{
  "theme": {
    "images": {
      "theme_frame": "FirefoxSkinHeader.jpg"
    },
    "colors": {
      "frame": "#5526d4",
      "tab_background_text": "#27fa23"
    }
  },
  "version": "2.0",
  "name": "Original Characters",
  "manifest_version": 2,
  "description": "Characters that I created and others made art of."
}