Examine source code of Fox Colours

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Fox Colours",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(243, 173, 119)",
      "toolbar_text": "rgb(80, 58, 133)",
      "frame": "rgb(235, 125, 72)",
      "tab_background_text": "rgb(70, 51, 121)",
      "toolbar_field": "rgb(242, 237, 180)",
      "toolbar_field_text": "rgb(67, 56, 139)",
      "tab_line": "rgb(238, 101, 39)",
      "popup": "rgb(230, 220, 255)",
      "popup_text": "rgb(71, 49, 125)",
      "ntp_background": "rgb(245, 209, 190)",
      "tab_loading": "rgb(238, 101, 39)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f582bf6b-4014-435b-893a-032564c88911}"
    }
  }
}