Examine source code of Steam Rep Counter

{
  "manifest_version": 3,
  "name": "Steam Rep Counter",
  "version": "1.1.0",
  "description": "Counts +rep/-rep in Steam comments with advanced settings and highlighting.",
  "author": "TNT CARDBOARD",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage"
  ],
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png"
    },
    "default_title": "SteamRepCounter Settings",
    "default_popup": "settings/settings.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://steamcommunity.com/id/*",
        "https://steamcommunity.com/profiles/*"
      ],
      "css": [
        "styles.css"
      ],
      "js": [
        "reputation_patterns.js",
        "localization.js",
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "SteamRepCounter@tnt-cardboard"
    }
  }
}