Examine source code of Habitat 67bis

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#c7b9b9",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Habitat 67bis",
  "manifest_version": 2,
  "description": "An fit window theme from Habitat 67 Living Complex"
}