Examine source code of Gruvy

{
  "name": "Gruvy",
  "manifest_version": 2,
  "version": "6.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(43, 53, 68, 1)",
      "tab_background_text": "rgba(155, 225, 202, 1)",
      "toolbar": "rgba(51, 64, 85, 1)",
      "bookmark_text": "rgba(46, 223, 164, 1)",
      "toolbar_field": "rgba(38, 49, 63, 1)",
      "toolbar_field_text": "rgba(168, 176, 187, 1)"
    }
  }
}