Examine source code of TSOW

{
  "manifest_version": 2,
  "short_name": "__MSG_extensionShortName__",
  "homepage_url": "https://www.arventor.de/tsow/",
  "author": "Peter Scholz & libitaacbeatus",
  "name": "__MSG_extensionName__",
  "version": "0.1.16resigned1",
  "description": "__MSG_extensionDescription__",
  "icons": {
    "16": "icons/16x16.png",
    "32": "icons/32x32.png",
    "48": "icons/48x48.png",
    "96": "icons/96x96.png",
    "128": "icons/128x128.png"
  },
  "default_locale": "en",
  "applications": {
    "gecko": {
      "id": "tsow@arventor.de",
      "strict_min_version": "49.0"
    }
  },
  "minimum_chrome_version": "52",
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.arventor.de/tsow/tsowtest.html",
        "https://www.diesiedleronline.de/de/spielen",
        "https://www.tsotesting.com/en/play",
        "https://www.thesettlersonline.com/en/play",
        "https://www.thesettlersonline.net/en/play",
        "https://www.thesettlersonline.fr/fr/jouer",
        "https://www.juego-thesettlersonline.com/es/jugar",
        "https://www.thesettlersonline.ru/ru/play",
        "https://www.thesettlersonline.pl/pl/graj",
        "https://www.thesettlersonline.es/es/jugar",
        "https://www.thesettlersonline.nl/nl/play",
        "https://www.thesettlersonline.cz/cs/play",
        "https://www.thesettlersonline.com.br/pt/jogar",
        "https://www.thesettlersonline.it/it/gioca",
        "https://www.thesettlersonline.gr/el/play",
        "https://www.thesettlersonline.ro/ro/play"
      ],
      "css": [
        "css/widget.css"
      ],
      "js": [
        "widget.js"
      ]
    }
  ]
}