Examine source code of Vintage Colorbars

{
  "theme": {
    "images": {
      "theme_frame": "vintage-colorbar-03-header.jpg"
    },
    "colors": {
      "frame": "#cc995a",
      "tab_background_text": "#21140b"
    }
  },
  "version": "2.0",
  "name": "Vintage Colorbars",
  "manifest_version": 2,
  "description": "Dirty, vintage color bars. No test pattern at all ;D"
}