Examine source code of White on White

{
  "name": "White on White",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "WhiteonWhiteH.jpg"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(15, 14, 14, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(20, 19, 19, 1)",
      "toolbar_field": "rgba(255, 255, 255, 0.08)",
      "toolbar_field_text": "rgba(28, 25, 25, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1bceb37a-3c24-4d1c-a328-53fc765a80f4}"
    }
  }
}