Steam Switch Checker

Find the lowest Nintendo eShop price for Steam games directly on Steam pages.
Powered by eShop-Prices.

Overview

Steam Switch Checker injects a compact card into Steam app pages and shows:

• matched title on eShop-Prices
• cheapest price in selected currency
• country/store with the lowest price

It supports language and currency selection from the popup.

Why It Opens A Background Tab

eShop-Prices is protected by anti-bot checks (Cloudflare). In many environments, direct extension fetch() calls can return challenge pages or 403.

To ensure stable results, the extension uses this strategy:

1. Try direct fetch in the service worker.
2. If blocked/challenged, load the same URL in a hidden background tab and read the final HTML.

This behavior is intentional and required for reliability under CORS/challenge protection.

Features

• Works on all store.steampowered.com/app/* pages
• Lowest eShop price + country output
• Popup settings: language + currency
• Supports dynamic Steam navigation
• No external backend server required

Installation (Developer Mode)

1. Download this repository or clone it.
2. Go to chrome://extensions.
3. Enable Developer Mode.
4. Click Load unpacked.
5. Select the project folder.

Build ZIP Package

A release ZIP is generated in release/steam-switch-checker-v1.1.0.zip and can be used for distribution.

Permissions

Permission	Reason
storage	Save language/currency preferences
tabs	Refresh active tab and hidden-tab fallback for blocked requests
scripting	Read HTML from hidden fallback tab
declarativeNetRequestWithHostAccess	Header adjustments for network compatibility
host_permissions: store.steampowered.com	Inject card into Steam pages
host_permissions: eshop-prices.com	Query and parse eShop-Prices data

Project Structure

steam-switch-checker/
├── manifest.json
├── background.js
├── content.js
├── popup.html
├── popup.js
├── rules.json
├── icon16.png
├── icon32.png
├── icon48.png
├── icon128.png
├── README.md
└── LICENSE

License

MIT - see LICENSE.