Examine source code of RED NIGHT/DARK MODE

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "RED NIGHT/DARK MODE",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(250, 41, 57, 0.35)",
      "toolbar_text": "rgb(206, 105, 105)",
      "frame": "rgb(28, 25, 25)",
      "tab_background_text": "rgb(206, 105, 105)",
      "toolbar_field": "rgb(28, 25, 25)",
      "toolbar_field_text": "rgb(206, 105, 105)",
      "tab_line": "rgba(28, 9, 1, 0.59)",
      "popup": "rgb(87, 14, 20)",
      "popup_text": "rgb(206, 105, 105)",
      "button_background_hover": "rgb(0, 0, 0)",
      "icons_attention": "rgb(93, 33, 33)",
      "ntp_background": "rgb(232, 122, 122)",
      "ntp_text": "rgb(193, 26, 26)",
      "popup_border": "rgb(193, 26, 26)",
      "popup_highlight": "rgb(193, 26, 26)",
      "sidebar_border": "rgb(193, 26, 26)",
      "sidebar_highlight": "rgb(193, 26, 26)",
      "sidebar": "rgb(193, 26, 26)",
      "toolbar_bottom_separator": "rgba(234, 105, 135, 0)",
      "tab_loading": "rgba(28, 9, 1, 0.59)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{53564713-f181-469d-97e3-58614d3882b3}"
    }
  }
}