Examine source code of Virtuel-1624425f84

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#c7c7c7",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Virtuel-1624425f84",
  "manifest_version": 2,
  "description": "This theme can be used in gmail with the picture paysage-virtuel-1624425f84 which can be found on internet."
}