Examine source code of Fox Colours Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Fox Colours Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(159, 64, 37)",
      "toolbar_text": "rgb(238, 202, 57)",
      "frame": "rgb(181, 96, 0)",
      "tab_background_text": "rgb(242, 190, 72)",
      "toolbar_field": "rgb(80, 0, 0)",
      "toolbar_field_text": "rgb(243, 216, 139)",
      "tab_line": "rgb(58, 51, 148)",
      "popup": "rgb(66, 29, 147)",
      "popup_text": "rgb(243, 229, 125)",
      "ntp_background": "rgb(42, 44, 69)",
      "tab_loading": "rgb(58, 51, 148)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1de088ec-c1df-4990-8e7b-02485f53d2a1}"
    }
  }
}