Examine source code of Kirby Colours!

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Kirby Colours!",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(248, 112, 140)",
      "toolbar_text": "rgb(45, 52, 136)",
      "frame": "rgb(249, 55, 105)",
      "tab_background_text": "rgb(68, 95, 230)",
      "toolbar_field": "rgb(45, 52, 136)",
      "toolbar_field_text": "rgb(247, 98, 66)",
      "tab_line": "rgb(248, 112, 140)",
      "popup": "rgb(45, 52, 136)",
      "popup_text": "rgb(251, 58, 53)",
      "tab_loading": "rgb(248, 112, 140)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fe6c340e-4361-4919-ad38-63c8ace95e91}"
    }
  }
}