Examine source code of Sign Connect

{
  "manifest_version": 2,
  "name": "Sign Connect",
  "version": "0.1.6",
  "description": "The browser extension to translate the content of websites into sign language.",
  "icons": {
    "192": "assets/icon/signconnect.png"
  },
  "web_accessible_resources": [
    "assets/icon/hands.png",
    "assets/icon/hands-hover.png"
  ],
  "permissions": [
    "*://browserplugin.signconnect.pl/*",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/bundle-scripts.js"
      ],
      "css": [
        "content-scripts/style.css"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "assets/icon/signconnect.png",
    "default_title": "Sign Connect",
    "default_popup": "popup/popup.html"
  }
}