Examine source code of Steamworks Extras

{
  "manifest_version": 3,
  "name": "Steamworks Extras",
  "version": "3.1.1",
  "author": "Alex Blintsov",
  "homepage_url": "https://steamextras.com",
  "permissions": [
    "storage",
    "offscreen"
  ],
  "host_permissions": [
    "https://store.steampowered.com/*",
    "https://partner.steampowered.com/*",
    "https://partner.steamgames.com/*",
    "https://steamcommunity.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://partner.steamgames.com/apps/navtrafficstats/*"
      ],
      "js": [
        "content/traffic/apptraffic.js"
      ],
      "css": [
        "styles/partner_steampowered_shared.css",
        "styles/apptraffic.css"
      ]
    },
    {
      "matches": [
        "https://partner.steampowered.com/app/wishlist/*"
      ],
      "js": [
        "content/appwishlists/appwishlist.js"
      ],
      "css": [
        "styles/partner_steampowered_shared.css",
        "styles/appwishlist.css"
      ]
    },
    {
      "matches": [
        "https://partner.steampowered.com/app/details/*"
      ],
      "js": [
        "content/appdetails/appdetails.js"
      ],
      "css": [
        "styles/partner_steampowered_shared.css",
        "styles/appdetails.css"
      ]
    },
    {
      "matches": [
        "https://partner.steampowered.com/package/refunds/*"
      ],
      "js": [
        "content/refunds/refunds.js"
      ],
      "css": [
        "styles/partner_steampowered_shared.css",
        "styles/refunds.css"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "data/chartcolors.json",
        "data/extensionstatuses.json",
        "data/defaulsettings.js",
        "background/offscreen/offscreen.html",
        "background/offscreen/offscreen.js",
        "assets/status_info.png",
        "assets/status_warning.png",
        "assets/status_error.png"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self' http://localhost:3000; object-src 'self'"
  },
  "options_page": "options/options.html",
  "background": {
    "scripts": [
      "background/extensionservice.js"
    ],
    "service_worker": "background/extensionservice.js"
  },
  "action": {
    "default_popup": "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ext@steamextras.com"
    }
  },
  "icons": {
    "16": "assets/icon-16.png",
    "48": "assets/icon-48.png",
    "128": "assets/icon-128.png"
  }
}