Examine source code of Arch FFMZ

{
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "arch@ffmz",
      "strict_min_version": "67.0"
    }
  },
  "version": "1.4",
  "name": "Arch",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(249, 249, 251)",
      "toolbar_text": "rgba(91, 91, 102)",
      "frame": "rgb(41, 45, 53)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(240,240,244)",
      "toolbar_field_text": "rgb(21, 20, 26)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(21, 20, 26)",
      "popup_border": "rgb(255, 255, 255)",
      "tab_text": "rgb(21, 20, 26)",
      "toolbar_bottom_separator": "rgb(204,204,204)",
      "toolbar_field_border": "rgb(208, 208, 208)",
      "toolbar_field_focus": "rgb(253, 253, 253)",
      "tab_selected": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  }
}