Examine source code of Gearbox

{
  "theme": {
    "images": {
      "theme_frame": "gear.jpg"
    },
    "colors": {
      "frame": "#6b3a10",
      "tab_background_text": "#822d0e"
    }
  },
  "version": "2.0",
  "name": "Gearbox",
  "manifest_version": 2,
  "description": "a basic steampunk style persona.  works best with a toolbar or two."
}