Examine source code of GraphiteFox

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Graphite",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(28, 28, 27)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(28, 28, 27)",
      "tab_background_text": "rgb(172, 179, 173)",
      "toolbar_field": "rgb(28, 28, 27)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(84, 84, 84)",
      "popup_text": "rgb(238, 238, 238)",
      "ntp_background": "rgb(0, 0, 0)",
      "sidebar_border": "rgba(255, 0, 0, 0)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(28, 28, 27)",
      "tab_background_separator": "rgba(117, 70, 70, 0)",
      "tab_selected": "rgba(235, 40, 40, 0)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgba(117, 70, 70, 0)",
      "toolbar_field_highlight": "rgba(38, 24, 24, 0)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9aeef31d-49af-4b7c-8ef6-116500e4e67f}"
    }
  }
}