Examine source code of GitHub Dark Modern

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "GitHub Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(13, 17, 23)",
      "toolbar_text": "rgb(145, 152, 161)",
      "frame": "rgb(1, 4, 9)",
      "tab_background_text": "rgb(145, 152, 161)",
      "toolbar_field": "rgb(1, 4, 9)",
      "toolbar_field_text": "rgb(240, 246, 252)",
      "tab_line": "rgb(61, 68, 77)",
      "popup": "rgb(21, 27, 35)",
      "popup_text": "rgb(240, 246, 252)",
      "button_background_active": "rgba(101, 108, 118, 0.25)",
      "button_background_hover": "rgba(101, 108, 118, 0.21)",
      "frame_inactive": "rgb(13, 17, 23)",
      "icons_attention": "rgb(145, 152, 161)",
      "icons": "rgb(145, 152, 161)",
      "ntp_background": "rgb(1, 4, 9)",
      "ntp_card_background": "rgb(21, 27, 35)",
      "ntp_text": "rgb(240, 246, 252)",
      "popup_border": "rgb(61, 68, 77)",
      "popup_highlight": "rgba(101, 108, 118, 0.25)",
      "sidebar_border": "rgb(61, 68, 77)",
      "sidebar_highlight": "rgba(101, 108, 118, 0.25)",
      "sidebar_text": "rgb(240, 246, 252)",
      "sidebar": "rgb(21, 27, 35)",
      "tab_text": "rgb(240, 246, 252)",
      "toolbar_bottom_separator": "rgb(61, 68, 77)",
      "toolbar_field_border_focus": "rgb(31, 111, 235)",
      "toolbar_field_border": "rgb(61, 68, 77)",
      "toolbar_field_focus": "rgb(13, 17, 23)",
      "toolbar_field_highlight": "rgba(31, 111, 235, 0.7)",
      "toolbar_top_separator": "rgb(61, 68, 77)",
      "tab_loading": "rgb(61, 68, 77)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0baae348-4d77-452d-8a51-514d34918dca}"
    }
  }
}