Examine source code of Black&Colourful

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Black&Colourful",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(240, 240, 240)",
      "toolbar_text": "rgb(24, 126, 233)",
      "frame": "rgb(56, 62, 79)",
      "tab_background_text": "rgb(90, 215, 36)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(184, 12, 222)",
      "tab_line": "rgb(8, 237, 70)",
      "popup": "rgb(243, 244, 247)",
      "popup_text": "rgb(23, 105, 238)",
      "button_background_active": "rgba(0, 129, 255, 0.44)",
      "button_background_hover": "rgba(81, 179, 255, 0.2)",
      "tab_text": "rgb(245, 142, 10)",
      "tab_loading": "rgb(8, 237, 70)"
    }
  }
}