Examine source code of ETF

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#fffafa",
      "tab_background_text": "#f73131"
    }
  },
  "version": "2.0",
  "name": "ETF",
  "manifest_version": 2,
  "description": "Theme based on logo \"ETF\" from \"Etablissement Techniques Fragnière SA\", a company working in electricity and telecom from switzerland."
}