Examine source code of Minimal Grey

{
  "manifest_version": 3,
  "version": "2.0.0",
  "name": "Minimal Grey",
  "description": "A minimalist, grey Firefox theme",
  "browser_specific_settings": {
    "gecko": {
      "id": "{0cb2ea52-7413-431a-876b-45d0ab47697d}",
      "strict_min_version": "109.0"
    }
  },
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(235, 235, 235)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(78, 78, 78)",
      "tab_background_text": "rgb(200, 200, 200)",
      "toolbar_field": "rgb(235, 235, 235)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(235, 235, 235)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(235, 235, 235)"
    }
  }
}