Examine source code of Fox Nightly Uniform Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Fox Nightly Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-019-7ce748211c61f9059493d4c4378e8a74.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(7, 50, 84)",
      "toolbar_text": "rgb(255, 42, 138)",
      "frame": "rgb(14, 41, 65)",
      "tab_background_text": "rgb(0, 221, 255)",
      "toolbar_field": "rgb(14, 41, 65)",
      "toolbar_field_text": "rgb(0, 221, 255)",
      "tab_line": "rgb(255, 42, 138)",
      "popup": "rgb(7, 50, 84)",
      "popup_text": "rgb(255, 42, 138)",
      "tab_loading": "rgb(255, 42, 138)"
    }
  }
}