Examine source code of Clean Gray Theme

{
  "name": "363000000000000572",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "png-drop-shadows-pure-white-png-800_600.png"
    },
    "colors": {
      "frame": "rgba(128, 128, 128, 1)",
      "tab_background_text": "rgba(48, 48, 48, 1)",
      "toolbar": "rgba(74, 74, 74, 1)",
      "bookmark_text": "rgba(179, 179, 179, 1)",
      "toolbar_field": "rgba(128, 128, 128, 1)"
    }
  }
}