Examine source code of Electromagnetic

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Header.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#170000"
    }
  },
  "version": "2.0",
  "name": "Electromagnetic",
  "manifest_version": 2,
  "description": "A slice of the electromagnetic spectrum in your browser window.\n\nLooks best on Mac OS, or with the menu bar hidden on Windows."
}