Examine source code of Matrix Gray 1 theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Matrix Gray 1 theme",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(126, 126, 126)",
      "toolbar_text": "rgb(238, 229, 231)",
      "frame": "rgb(85, 84, 84)",
      "tab_background_text": "rgb(229, 216, 219)",
      "toolbar_field": "rgb(103, 103, 103)",
      "toolbar_field_text": "rgb(232, 232, 240)",
      "tab_line": "rgb(208, 199, 201)",
      "popup": "rgba(85, 84, 84, 0.94)",
      "popup_text": "rgb(240, 231, 231)",
      "tab_loading": "rgb(208, 199, 201)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fae8e714-5379-4315-9d74-e7def94e2f4a}"
    }
  }
}