Examine source code of Transparent Nights

{
  "name": "Transparent Nights",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "parts-14-black-blue.png"
    },
    "colors": {
      "frame": "rgba(112, 112, 112, 1)",
      "tab_background_text": "rgba(173, 173, 173, 1)",
      "toolbar": "rgba(6, 32, 163, 0.2)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(0, 40, 184, 0.94)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(0, 77, 255, 0.66)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{25d3cab6-8026-4971-8ba6-773a32bba424}"
    }
  }
}