Examine source code of greymatter

{
  "name": "greymatter",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "450520.jpg"
    },
    "colors": {
      "frame": "rgba(23, 23, 23, 1)",
      "tab_background_text": "rgba(150, 150, 150, 1)",
      "toolbar": "rgba(80, 80, 80, 1)",
      "bookmark_text": "rgba(150, 150, 150, 1)",
      "toolbar_field": "rgba(46, 46, 46, 1)",
      "toolbar_field_text": "rgba(186, 186, 186, 1)"
    }
  }
}