Examine source code of Dark Monochrome

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Dark Monochrome",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(30, 30, 30)",
      "toolbar_text": "rgb(203, 203, 203)",
      "frame": "rgb(18, 18, 18)",
      "tab_background_text": "rgb(203, 203, 203)",
      "toolbar_field": "rgb(18, 18, 18)",
      "toolbar_field_text": "rgb(203, 203, 203)",
      "tab_line": "rgba(248, 112, 140, 0)",
      "popup": "rgb(30, 30, 30)",
      "popup_text": "rgb(203, 203, 203)",
      "icons_attention": "rgb(217, 217, 217)",
      "ntp_background": "rgb(18, 18, 18)",
      "popup_highlight": "rgb(53, 53, 53)",
      "toolbar_field_focus": "rgb(18, 18, 18)",
      "toolbar_field_highlight_text": "rgb(217, 217, 217)",
      "toolbar_field_highlight": "rgb(53, 53, 53)",
      "tab_loading": "rgba(248, 112, 140, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d4df907f-fac3-4e54-bdfe-4aaf276faf77}"
    }
  }
}