Examine source code of Microsoft Edge Dark Theme dft

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Microsoft Edge Dark Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(60, 60, 60)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(32, 32, 32)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(40, 40, 40)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(60, 60, 60)",
      "popup": "rgb(60, 60, 60)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(78, 78, 78)",
      "button_background_hover": "rgb(67, 67, 67)",
      "frame_inactive": "rgb(46, 46, 46)",
      "icons_attention": "rgb(146, 146, 146)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(36, 36, 36)",
      "ntp_text": "rgb(185, 185, 185)",
      "popup_border": "rgb(60, 60, 60)",
      "tab_selected": "rgb(60, 60, 60)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(60, 60, 60)",
      "toolbar_field_border_focus": "rgb(147, 184, 231)",
      "toolbar_field_border": "rgb(60, 60, 60)",
      "toolbar_field_focus": "rgb(44, 44, 44)",
      "toolbar_field_highlight_text": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgb(147, 184, 231)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(60, 60, 60)",
      "tab_loading": "rgb(60, 60, 60)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b2c9c3f1-ea4d-4c4e-894c-ab269f202e26}"
    }
  }
}