Examine source code of Ubuntu Ambiance Theme

{
  "theme": {
    "images": {
      "theme_frame": "ambiance-persona_header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Ubuntu Ambiance Theme",
  "manifest_version": 2,
  "description": "This persona embodies, at least a little, the default Ubuntu Ambiance theme."
}