Examine source code of Sweet Dark Blue

{
  "name": "Sweet Dark Blue",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "spinner-bottom.png"
    },
    "colors": {
      "frame": "rgba(46, 87, 105, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(46, 87, 105, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(27, 27, 62, 1)",
      "toolbar_field_text": "rgba(255, 140, 204, 1)",
      "tab_line": "rgba(255, 140, 204, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dd567072-acc9-4c4d-8d20-37cb38e0b37f}"
    }
  }
}