Examine source code of Doom vibrant

{
  "name": "Doom vibrant",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "rounded.png"
    },
    "colors": {
      "frame": "rgba(46, 51, 63, 1)",
      "tab_background_text": "rgba(187, 194, 207, 1)",
      "toolbar": "rgba(46, 51, 63, 1)",
      "bookmark_text": "rgba(187, 194, 207, 1)",
      "toolbar_field": "rgba(187, 194, 207, 1)",
      "toolbar_field_text": "rgba(46, 51, 63, 1)",
      "tab_line": "rgba(187, 194, 207, 1)"
    }
  }
}