Examine source code of AO3: No Numbers

{
  "manifest_version": 2,
  "name": "AO3: No Numbers",
  "version": "1.0",
  "description": "Removes information on kudos, bookmarks and hits on AO3.",
  "icons": {
    "48": "icons/noNumbersAO3FavIcon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.archiveofourown.org/*"
      ],
      "css": [
        "noNumbersAO3.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{89887cd0-9469-4604-99ad-addf8af71305}"
    }
  }
}