Examine source code of FACEIT Leetify rating

{
  "manifest_version": 2,
  "name": "FACEIT Leetify rating",
  "version": "1.7.0",
  "homepage_url": "https://github.com/shakerrrr/faceit-leetify-rating",
  "description": "A small script that displays leetify ratings on FACEIT.",
  "content_scripts": [
    {
      "matches": [
        "*://*.faceit.com/*"
      ],
      "js": [
        "faceit-leetify-rating.js"
      ]
    }
  ],
  "permissions": [
    "*://*.faceit.com/*",
    "*://*.leetify.com/*",
    "webRequest"
  ],
  "icons": {
    "32": "icons/icon_32.png"
  },
  "author": "shaker",
  "browser_specific_settings": {
    "gecko": {
      "id": "{f63651e2-fb90-4fdb-833d-d2b4fb19e6aa}"
    }
  }
}