Examine source code of orange-dark-gray

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "orange-dark-gray",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(35, 32, 35)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(35, 32, 35)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(51, 51, 51)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 77, 1)",
      "popup": "rgb(34, 34, 34)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgba(255, 77, 1, 0.57)",
      "button_background_hover": "rgba(255, 77, 1, 0.57)",
      "icons_attention": "rgba(255, 77, 1, 0.57)",
      "tab_loading": "rgba(255, 77, 1, 0.57)",
      "tab_selected": "rgba(255, 77, 1, 0.32)",
      "toolbar_field_highlight": "rgba(255, 77, 1, 0.57)",
      "toolbar_vertical_separator": "rgba(255, 77, 1, 0.57)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{927346ee-4eee-4d57-9741-5af8e849c6a6}"
    }
  }
}