Examine source code of QBST4

{
  "name": "QBST4",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "cubist-1rd.png"
    },
    "colors": {
      "frame": "rgba(212, 111, 17, 1)",
      "tab_background_text": "rgba(245, 171, 12, 1)",
      "toolbar": "rgba(179, 43, 43, 0.24)",
      "bookmark_text": "rgba(245, 171, 12, 1)",
      "toolbar_field": "rgba(97, 39, 39, 0.31)",
      "toolbar_field_text": "rgba(250, 242, 8, 1)"
    }
  }
}