Examine source code of Midnight Espresso

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Espresso",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(32, 30, 30)",
      "toolbar_text": "rgb(140, 89, 87)",
      "frame": "rgb(53, 44, 44)",
      "tab_background_text": "rgb(140, 89, 87)",
      "toolbar_field": "rgb(17, 17, 17)",
      "toolbar_field_text": "rgb(140, 89, 87)",
      "tab_line": "rgb(140, 89, 87)",
      "popup": "rgb(17, 17, 17)",
      "popup_text": "rgb(140, 89, 87)",
      "ntp_background": "rgb(21, 21, 21)",
      "ntp_text": "rgb(200, 132, 130)",
      "toolbar_field_border_focus": "rgb(79, 48, 47)",
      "toolbar_field_focus": "rgb(17, 17, 17)",
      "toolbar_field_highlight_text": "rgb(160, 109, 107)",
      "toolbar_field_highlight": "rgb(62, 40, 39)",
      "tab_loading": "rgb(140, 89, 87)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{68613eb7-e74d-4b2d-ad35-eb66916282e4}"
    }
  }
}