Examine source code of Graphite Flat

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Graphite Flat",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(44, 44, 44)",
      "toolbar_text": "rgb(226, 226, 226)",
      "frame": "rgb(44, 44, 44)",
      "tab_background_text": "rgb(226, 226, 226)",
      "toolbar_field": "rgb(187, 187, 187)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgba(104, 93, 93, 0)",
      "popup": "rgb(34, 34, 34)",
      "popup_text": "rgb(212, 212, 212)",
      "button_background_hover": "rgb(33, 33, 33)",
      "ntp_background": "rgb(33, 33, 33)",
      "popup_border": "rgba(212, 212, 212, 0)",
      "sidebar_border": "rgba(221, 15, 221, 0)",
      "sidebar_highlight_text": "rgb(44, 44, 44)",
      "sidebar_highlight": "rgb(226, 226, 226)",
      "tab_background_separator": "rgba(221, 15, 221, 0)",
      "tab_loading": "rgb(44, 44, 44)",
      "tab_selected": "rgb(226, 226, 226)",
      "tab_text": "rgb(44, 44, 44)",
      "toolbar_bottom_separator": "rgb(45, 45, 45)",
      "toolbar_field_border_focus": "rgba(221, 22, 22, 0)",
      "toolbar_field_focus": "rgb(68, 68, 68)",
      "toolbar_field_highlight_text": "rgb(44, 44, 44)",
      "toolbar_field_highlight": "rgb(226, 226, 226)",
      "toolbar_field_separator": "rgba(212, 17, 17, 0)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgba(221, 15, 221, 0)",
      "toolbar_vertical_separator": "rgba(212, 17, 17, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{67118a6e-ca52-4bcf-8da8-93b3d2e23cb6}"
    }
  }
}