Examine source code of Ubuntu Font Styler

{
  "manifest_version": 2,
  "name": "Ubuntu Font Styler",
  "version": "1.2",
  "description": "Extension applies the Ubuntu font across all web pages for a cleaner and more visually appealing browsing experience. Built in just 15 minutes, it may not be the most refined, but it effectively replaces fonts using basic style overrides.",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{45e699bb-3d59-4d96-b082-7fc563245cd2}"
    }
  }
}