Examine source code of Cennik - Price Tracker

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "0.1.0",
  "default_locale": "en",
  "description": "__MSG_extensionDescription__",
  "browser_specific_settings": {
    "gecko": {
      "id": "cennik@extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "16": "icons/icon.svg",
    "32": "icons/icon.svg",
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "permissions": [
    "storage",
    "alarms",
    "notifications",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "lib/i18n.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "__MSG_actionTitle__",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon.svg",
      "32": "icons/icon.svg"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.wildberries.ru/*"
      ],
      "js": [
        "lib/i18n.js",
        "content/widget-dom.js",
        "content/wb.js"
      ],
      "css": [
        "content/wb.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://*.ozon.ru/*"
      ],
      "js": [
        "lib/i18n.js",
        "content/widget-dom.js",
        "content/ozon.js"
      ],
      "css": [
        "content/wb.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "exclude_matches": [
        "*://*.wildberries.ru/*",
        "*://*.ozon.ru/*"
      ],
      "js": [
        "lib/i18n.js",
        "content/widget-dom.js",
        "content/generic.js"
      ],
      "css": [
        "content/wb.css"
      ],
      "run_at": "document_idle"
    }
  ]
}