Examine source code of Fire Fox dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "fire fox dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-016-0cce7a5c7842040fcc0e297a42678307.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(62, 63, 63)",
      "toolbar_text": "rgb(235, 241, 241)",
      "frame": "rgb(29, 29, 29)",
      "tab_background_text": "rgb(211, 214, 214)",
      "toolbar_field": "rgb(228, 232, 232)",
      "toolbar_field_text": "rgb(34, 36, 36)",
      "tab_line": "rgb(5, 239, 247)",
      "popup": "rgb(62, 69, 70)",
      "popup_text": "rgb(225, 231, 232)",
      "tab_loading": "rgb(5, 239, 247)"
    }
  }
}