Examine source code of Schavemaker

{
  "theme": {
    "images": {
      "theme_frame": "schavemaker-logo-header.JPG"
    },
    "colors": {
      "frame": "#c7c7c7",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Schavemaker",
  "manifest_version": 2,
  "description": "Mozilla schavemaker logo"
}