Examine source code of Dark blue

{
  "name": "Dark blue",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "mooooon.png"
    },
    "colors": {
      "frame": "rgba(10, 10, 33, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(12, 12, 24, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(128, 128, 128, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4466d8f5-dd09-4028-af80-f7f472e60991}"
    }
  }
}