Examine source code of artifex GDS

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "artifex",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(118, 165, 165, 0.57)",
      "toolbar_text": "rgb(242, 248, 248)",
      "frame": "rgb(118, 165, 165)",
      "tab_background_text": "rgb(0, 8, 8)",
      "toolbar_field": "rgba(241, 241, 245, 0.24)",
      "toolbar_field_text": "rgba(238, 15, 9, 0.98)",
      "tab_line": "rgb(41, 148, 32)",
      "popup": "rgba(31, 34, 61, 0)",
      "popup_text": "rgb(215, 226, 239)",
      "tab_loading": "rgb(41, 148, 32)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{904c0453-cf7f-40b8-b5ad-050bfbc77a28}"
    }
  }
}