Examine source code of GeForce Now Lookup

{
  "name": "GeForce Now Lookup",
  "version": "1.1.0",
  "description": "Lookup the compatibility of any game on Steam within the extension",
  "manifest_version": 2,
  "icons": {
    "128": "icon_128-active.png"
  },
  "browser_action": {
    "default_icon": "icon_128.png",
    "default_title": "GeForce Now Lookup",
    "default_popup": "index.html"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "https://steamcommunity.com/*",
    "https://store.steampowered.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://store.steampowered.com/*",
        "https://steamcommunity.com/*"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b7c5ece5-5365-4bab-aa6f-e58a513b6e55}"
    }
  }
}