Examine source code of Graphite-FF

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Graphite",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(57, 69, 81)",
      "toolbar_text": "rgb(204, 204, 204)",
      "frame": "rgb(25, 29, 33)",
      "tab_background_text": "rgb(215, 226, 239)",
      "toolbar_field": "rgb(57, 69, 81)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(205, 35, 185, 0)",
      "popup": "rgb(23, 27, 31)",
      "popup_text": "rgb(215, 226, 239)",
      "button_background_hover": "rgba(245, 245, 245, 0)",
      "icons": "rgb(229, 229, 229)",
      "tab_text": "rgb(248, 248, 248)",
      "toolbar_field_border": "rgba(204, 204, 204, 0)",
      "tab_loading": "rgba(205, 35, 185, 0)"
    }
  }
}