Examine source code of Harder.fi persona

{
  "theme": {
    "images": {
      "theme_frame": "harder.fi.logo-top.jpg"
    },
    "colors": {
      "frame": "#b3b300",
      "tab_background_text": "#f6fcc0"
    }
  },
  "version": "2.0",
  "name": "Harder.fi persona",
  "manifest_version": 2,
  "description": "The offical Harder.fi persona for harder.fi people."
}