Examine source code of Adapta Material

{
  "name": "Adapta",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "220px-Empty.png"
    },
    "colors": {
      "toolbar": "rgba(69, 90, 100, 1)",
      "toolbar_field": "rgba(250, 250, 250, 1)",
      "toolbar_field_text": "rgba(38, 50, 56, 1)",
      "frame": "rgba(55, 71, 79, 1)",
      "tab_background_text": "rgba(250, 250, 250, 1)",
      "bookmark_text": "rgba(250, 250, 250, 1)"
    }
  }
}