Examine source code of 9GAG AnonBlocker

{
  "manifest_version": 2,
  "name": "9GAG AnonBlocker",
  "description": "Block posts of anonymous users in your stream on 9GAG",
  "homepage_url": "https://github.com/acran/9gag-anonblocker",
  "author": "Roman Anasal",
  "version": "1.0.0",
  "icons": {
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    "icons/show.svg",
    "icons/hide.svg"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://9gag.com/*"
      ],
      "css": [
        "content.css"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5c8eab92-170d-4226-96c2-1df0dedc4aed}"
    }
  }
}