Examine source code of TransferHero

{
  "name": "TransferHero",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "transferhero-fb-header.jpg"
    },
    "colors": {
      "frame": "rgba(27, 30, 59, 0.8)",
      "tab_background_text": "rgba(61, 201, 106, 1)",
      "toolbar": "rgba(27, 31, 59, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(27, 31, 59, 1)"
    }
  }
}