Examine source code of JetBrains' Darcula

{
  "manifest_version": 2,
  "version": "1.2",
  "name": "JetBrains' Darcula",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-001-9c6d74e14860e77ee6f8f43e824bff25.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(60, 63, 65)",
      "toolbar_text": "rgb(169, 183, 198)",
      "frame": "rgb(35, 37, 37)",
      "tab_background_text": "rgb(169, 183, 198)",
      "toolbar_field": "rgb(35, 37, 37)",
      "toolbar_field_text": "rgb(169, 183, 198)",
      "tab_line": "rgb(35, 37, 37)",
      "popup": "rgb(35, 37, 37)",
      "popup_text": "rgb(169, 183, 198)",
      "icons_attention": "rgb(204, 120, 50)",
      "icons": "rgb(169, 183, 198)",
      "ntp_background": "rgb(50, 50, 50)",
      "ntp_text": "rgb(169, 183, 198)",
      "popup_border": "rgba(0, 0, 0, 0.08)",
      "sidebar_border": "rgb(50, 50, 50)",
      "sidebar_text": "rgb(169, 183, 198)",
      "sidebar": "rgb(60, 63, 65)",
      "tab_selected": "rgb(204, 120, 50)",
      "tab_text": "rgb(35, 37, 37)",
      "toolbar_bottom_separator": "rgb(60, 63, 65)",
      "toolbar_field_border_focus": "rgb(35, 37, 37)",
      "toolbar_field_border": "rgb(35, 37, 37)",
      "toolbar_field_highlight_text": "rgb(35, 37, 37)",
      "toolbar_field_highlight": "rgb(204, 120, 50)",
      "toolbar_field_separator": "rgb(204, 120, 50)",
      "toolbar_top_separator": "rgb(60, 63, 65)",
      "toolbar_vertical_separator": "rgba(169, 183, 198, 0.29)",
      "tab_loading": "rgb(35, 37, 37)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{42c13dc7-59b7-42f2-89a1-8c7a6a175386}"
    }
  }
}