Examine source code of Grey Shades

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Grey Shades",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(26, 26, 26)",
      "toolbar_text": "rgb(187, 187, 187)",
      "frame": "rgb(26, 26, 26)",
      "tab_background_text": "rgb(187, 187, 187)",
      "toolbar_field": "rgb(187, 187, 187)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(85, 85, 85)",
      "popup": "rgb(26, 26, 26)",
      "popup_text": "rgb(187, 187, 187)",
      "tab_loading": "rgb(85, 85, 85)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{be00b85d-8513-45d5-9f49-61f55737c25a}"
    }
  }
}