Examine source code of Red_Grey

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Red and Grey",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(240, 240, 244)",
      "toolbar_text": "rgb(153, 2, 30)",
      "frame": "rgb(195, 195, 198)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgba(248, 192, 192, 0.12)",
      "toolbar_field_text": "rgb(3, 3, 3)",
      "tab_line": "rgb(170, 11, 52)",
      "popup": "rgb(251, 240, 240)",
      "popup_text": "rgb(0, 0, 0)",
      "icons": "rgb(153, 2, 30)",
      "popup_border": "rgba(47, 5, 14, 0.97)",
      "tab_selected": "rgba(142, 3, 7, 0.51)",
      "tab_text": "rgb(248, 239, 239)",
      "toolbar_bottom_separator": "rgb(198, 40, 40)",
      "toolbar_field_border_focus": "rgb(198, 40, 40)",
      "toolbar_field_focus": "rgb(251, 240, 240)",
      "toolbar_top_separator": "rgb(255, 255, 255)",
      "tab_loading": "rgb(170, 11, 52)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0cac1e55-9be9-4d4b-9f77-4ad177d0a676}"
    }
  }
}