Examine source code of Форум Overclockers.ru

{
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "overclockersru@coolcmd",
      "strict_min_version": "52.0"
    }
  },
  "name": "Форум Overclockers.ru",
  "version": "2021.9.24",
  "description": "Доработка сайта и форума Overclockers.ru",
  "icons": {
    "128": "manifest.svg"
  },
  "author": "CoolCmd",
  "homepage_url": "https://coolcmd.tk/for/",
  "permissions": [
    "storage"
  ],
  "web_accessible_resources": [
    "webpage/*.*",
    "options.html"
  ],
  "options_ui": {
    "browser_style": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://overclockers.ru/*",
        "https://forums.overclockers.ru/*"
      ],
      "js": [
        "storage.js",
        "content.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://overclockers.ru/*"
      ],
      "css": [
        "site.css"
      ],
      "run_at": "document_start"
    }
  ]
}