Examine source code of Choso Black & Red Theme

{
  "manifest_version": 2,
  "version": "4.0",
  "name": "Choso Black & Red Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(23, 3, 3)",
      "tab_background_text": "rgb(255, 240, 240)",
      "toolbar_field": "rgb(43, 30, 30)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(168, 0, 0)",
      "popup": "rgb(43, 30, 30)",
      "popup_text": "rgb(247, 215, 214)",
      "button_background_hover": "rgba(168, 0, 0, 0.45)",
      "icons": "rgb(240, 30, 20)",
      "popup_border": "rgb(240, 30, 20)",
      "sidebar_highlight": "rgb(160, 30, 20)",
      "sidebar": "rgb(43, 30, 30)",
      "toolbar_bottom_separator": "rgb(240, 30, 20)",
      "toolbar_top_separator": "rgba(255, 255, 255, 0)",
      "tab_loading": "rgb(168, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{673c5b95-5cb9-4367-ab58-13526ca99fe7}"
    }
  }
}