Examine source code of Different Sky

{
  "name": "Different Sky",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "alena-aenami-cloud-shapes.jpg"
    },
    "colors": {
      "frame": "rgba(28, 28, 40, 0.95)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(37, 41, 59, 0.8)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(7, 13, 47, 1)",
      "toolbar_field_text": "rgba(185, 190, 220, 1)",
      "tab_line": "rgba(255, 255, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d2cf3037-c63a-44a6-8e06-acb3838e5671}"
    }
  }
}