Examine source code of Minimal dark

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Minimal Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(15, 15, 15, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(15, 15, 15)",
      "tab_background_text": "rgb(172, 172, 172)",
      "toolbar_field": "rgb(32, 32, 32)",
      "toolbar_field_text": "rgb(206, 206, 206)",
      "tab_line": "rgba(32, 32, 32, 0)",
      "popup": "rgba(32, 32, 32, 0.92)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(32, 32, 32)",
      "button_background_hover": "rgb(25, 25, 25)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(15, 15, 15)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_border": "rgba(255, 255, 255, 0)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "popup_highlight": "rgb(90, 90, 90)",
      "sidebar_border": "rgba(0, 255, 0, 0)",
      "tab_background_separator": "rgba(0, 255, 0, 0)",
      "tab_loading": "rgb(90, 90, 90)",
      "tab_selected": "rgb(32, 32, 32)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgba(255, 0, 0, 0)",
      "toolbar_field_border_focus": "rgb(0, 221, 255)",
      "toolbar_field_border": "rgba(255, 0, 0, 0)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgba(255, 255, 255, 0)",
      "toolbar_vertical_separator": "rgba(116, 81, 81, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1e733297-a47c-48be-abf1-1ca8028ab084}"
    }
  }
}