Examine source code of Filter for GA

{
  "manifest_version": 2,
  "name": "Filter for GA",
  "version": "1.3",
  "description": "Расширение для фильтрации сообщений на форуме Глобальной Авантюры",
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "*://glav.su/forum/*/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ]
}