Examine source code of Babel

{
  "manifest_version": 2,
  "minimum_chrome_version": "50",
  "name": "Babel",
  "short_name": "Babel",
  "author": "perceptron8",
  "description": "Web Extension forcing 'The Settlers Online' to use the same language as your browser!",
  "homepage_url": "https://github.com/perceptron8/babel.ext",
  "version": "0.0.5",
  "default_locale": "en",
  "icons": {
    "192": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.diesiedleronline.de/*",
        "https://www.juego-thesettlersonline.com/*",
        "https://www.thesettlersonline.com/*",
        "https://www.thesettlersonline.com.br/*",
        "https://www.thesettlersonline.cz/*",
        "https://www.thesettlersonline.es/*",
        "https://www.thesettlersonline.fr/*",
        "https://www.thesettlersonline.gr/*",
        "https://www.thesettlersonline.it/*",
        "https://www.thesettlersonline.net/*",
        "https://www.thesettlersonline.nl/*",
        "https://www.thesettlersonline.pl/*",
        "https://www.thesettlersonline.ro/*",
        "https://www.thesettlersonline.ru/*",
        "https://www.tsotesting.com/*"
      ],
      "run_at": "document_end",
      "js": [
        "script.js"
      ]
    }
  ]
}