Examine source code of Windows Hide

{
  "name": "Dark Gray",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "upper.png"
    },
    "colors": {
      "toolbar": "rgba(65, 65, 65, 1)",
      "toolbar_field": "rgba(92, 92, 92, 1)",
      "toolbar_field_text": "rgba(201, 201, 201, 1)",
      "frame": "rgba(65, 65, 65, 1)",
      "tab_background_text": "rgba(110, 110, 110, 1)",
      "bookmark_text": "rgba(201, 201, 201, 1)"
    }
  }
}