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manifest.json
{
  "manifest_version": 3,
  "content_scripts": [
    {
      "css": [
        "css.css"
      ],
      "matches": [
        "https://*.ya.ru/*",
        "https://*.yandex.ru/*",
        "https://*.dzen.ru/*"
      ]
    }
  ],
  "description": "This extension making more better ya.ru",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "name": "ya.ru better css",
  "update_url": "http://clients2.google.com/service/update2/crx",
  "version": "1.01"
}