Examine source code of Red Velvet

{
  "name": "Red Velvet",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "mine.jpg"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(43, 77, 171, 1)",
      "toolbar": "rgba(94, 235, 162, 1)",
      "bookmark_text": "rgba(235, 111, 129, 1)",
      "toolbar_field": "rgba(232, 226, 46, 1)",
      "toolbar_field_text": "rgba(186, 102, 232, 1)"
    }
  }
}