Examine source code of Red Velvet

{
  "name": "Red Velvet",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "rv.jpg"
    },
    "colors": {
      "frame": "rgba(14, 53, 138, 1)",
      "tab_background_text": "rgba(230, 92, 92, 1)",
      "toolbar": "rgba(147, 235, 124, 1)",
      "bookmark_text": "rgba(146, 81, 245, 1)",
      "toolbar_field": "rgba(250, 245, 108, 1)",
      "toolbar_field_text": "rgba(123, 235, 218, 1)"
    }
  }
}