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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "1.1.3",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "icons": {
    "48": "icons/border-48.png",
    "128": "icons/border-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.google.com/recaptcha/*"
      ],
      "all_frames": true,
      "js": [
        "recaptcha.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "recaptcha@strugee.net"
    }
  }
}