Examine source code of Old Glory

{
  "theme": {
    "images": {
      "theme_frame": "OldGloryHeader.jpg"
    },
    "colors": {
      "frame": "#ffd503",
      "tab_background_text": "#ffd503"
    }
  },
  "version": "2.0",
  "name": "Old Glory",
  "manifest_version": 2,
  "description": "U.S. Flag digitally painted  with Impressionist filter."
}