Examine source code of simple orange header

{
  "theme": {
    "images": {
      "theme_frame": "laranja_header.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "simple orange header",
  "manifest_version": 2,
  "description": "Header is orange, footer is not. (Or I'd think there's people calling me on Messenger all the time.)"
}