Examine source code of Gladiator 2 Header

{
  "theme": {
    "images": {
      "theme_frame": "gladiator.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Gladiator 2 Header",
  "manifest_version": 2,
  "description": "Important! This design is ideal for 100 pixel (default firefox) settings. However, to view more image go to View/Toolbars/Customize and add new toolbars. I have also included a similar larger version of this persona which you can find by viewing more of my personas.\nRussel Crowe lense flare blue black gladiator roman ancient movie film actor."
}