Examine source code of Simple Black Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Simple Black Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0.06)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(16, 17, 17)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(94, 94, 94, 0.34)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(255, 255, 255, 0)",
      "popup": "rgba(0, 0, 0, 0.82)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgba(255, 255, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c3ad7572-bfc6-471b-bd29-c9ce53380065}"
    }
  }
}