Examine source code of QLF

{
  "name": "QLF",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "index.jpg"
    },
    "colors": {
      "frame": "rgba(7, 0, 15, 0.7)",
      "tab_background_text": "rgba(0, 0, 0, 0.56)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0.48)",
      "toolbar_field_text": "rgba(0, 0, 0, 0.23)"
    }
  }
}