Examine source code of cool multicolour

{
  "name": "cool",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "teal-blue-lacanche-colour-sample.jpg"
    },
    "colors": {
      "toolbar": "rgba(4, 0, 255, 1)",
      "toolbar_field": "rgba(0, 255, 47, 1)",
      "toolbar_field_text": "rgba(255, 0, 0, 1)",
      "frame": "rgba(4, 0, 255, 1)",
      "tab_background_text": "rgba(0, 255, 200, 1)",
      "bookmark_text": "rgba(0, 157, 255, 1)"
    }
  }
}