Examine source code of SteamBuster

{
  "name": "SteamBuster",
  "version": "1.0",
  "description": "Hide Steam reviews to relive the 90s game store vibe. Inspired by a Cryaotic tweet.",
  "content_scripts": [
    {
      "matches": [
        "*://store.steampowered.com/app/*"
      ],
      "js": [
        "/reviewbuster.js"
      ]
    }
  ],
  "icons": {
    "48": "images/main.png"
  },
  "manifest_version": 2
}