Examine source code of Cool Dark Blue

{
  "name": "Shades of Blue",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "transparent.png"
    },
    "colors": {
      "frame": "rgba(0, 14, 46, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(184, 196, 219, 0.16)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(170, 180, 240, 0.33)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(20, 126, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{02d6d6cf-2308-41c0-9fc1-1a09a0e2602b}"
    }
  }
}