Examine source code of Cool Blue Spikes

{
  "name": "Cool Blue Spikes",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "index.jpg"
    },
    "colors": {
      "toolbar": "rgba(0, 88, 250, 1)",
      "toolbar_field_text": "rgba(13, 206, 224, 1)",
      "frame": "rgba(29, 96, 240, 1)",
      "tab_background_text": "rgba(10, 14, 138, 1)",
      "bookmark_text": "rgba(7, 222, 172, 1)"
    }
  }
}