Examine source code of minimalistisch grau

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "grau",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(236, 240, 236)",
      "toolbar_text": "rgb(94, 85, 88)",
      "frame": "rgb(208, 218, 219)",
      "tab_background_text": "rgb(78, 83, 79)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(89, 94, 98)",
      "tab_line": "rgb(195, 195, 195)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(108, 108, 108)",
      "tab_loading": "rgb(195, 195, 195)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bde1afb1-36b6-4c23-a555-5df91ae022a4}"
    }
  }
}