Examine source code of USA Blue Star

{
  "name": "USA Blue Star",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "starsbluewallpaper.png"
    },
    "colors": {
      "frame": "rgba(26, 29, 47, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(26, 29, 47, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(177, 34, 52, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(177, 34, 52, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{befc6966-31a3-4450-9549-f716bf63ab7f}"
    }
  }
}