Examine source code of Typo3 orange

{
  "theme": {
    "images": {
      "theme_frame": "typo3_header.png"
    },
    "colors": {
      "frame": "#fa8a00",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Typo3 orange",
  "manifest_version": 2,
  "description": "Typo3 Content management system at typo3.org"
}