Examine source code of FACE-X

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "FACE-X",
  "icons": {
    "16": "img/logo.png",
    "48": "img/logo.png",
    "128": "img/logo.png"
  },
  "version": "3.3",
  "manifest_version": 2,
  "description": "FACE-X is a Google Chrome extension that displays a users stats on FACEIT on their Steam profile.",
  "action": {
    "default_icon": "img/logo.png",
    "default_title": "FACE-X"
  },
  "host_permissions": [
    "https://api.faceit.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.mozilla.org/*",
        "*://*.steamcommunity.com/id/*",
        "*://*.steamcommunity.com/profiles/*"
      ],
      "exclude_matches": [
        "*://*.steamcommunity.com/id/*/allcomments*",
        "*://*.steamcommunity.com/profiles/*/allcomments*"
      ],
      "css": [
        "style.css"
      ],
      "js": [
        "scripts/main_new.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "img/levels/1.png",
    "img/levels/2.png",
    "img/levels/3.png",
    "img/levels/4.png",
    "img/levels/5.png",
    "img/levels/6.png",
    "img/levels/7.png",
    "img/levels/8.png",
    "img/levels/9.png",
    "img/levels/10.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{cd0d462b-9c76-4f2f-a9dd-582f102e9ae5}"
    }
  }
}