Examine source code of SleepyFox

{
  "name": "Sleepyfox",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "fox2.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(153, 64, 64, 0.1)",
      "toolbar_field": "rgba(179, 134, 134, 0.11)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{53aa63ac-1fde-4456-a878-6e2777c19c3a}"
    }
  }
}