Examine source code of Blackpule

{
  "name": "Blackpule",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Untitled.png"
    },
    "colors": {
      "frame": "rgba(3, 3, 3, 1)",
      "tab_background_text": "rgba(153, 151, 151, 1)",
      "toolbar": "rgba(38, 15, 46, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(41, 41, 41, 1)",
      "toolbar_field_text": "rgba(207, 178, 219, 1)",
      "tab_line": "rgba(46, 26, 56, 0.63)"
    }
  }
}