When you visit a Steam store page, the extension sends the Steam app IDs shown on that page to sub.aligueler.com to check whether the games are included in a subscription service. Together with the request, the extension version is transmitted. No user-identifiable data (Steam account, IP-based profiles, browsing history, cookies) is collected or stored.
Your extension settings are saved locally in your browser and never leave it.
If you choose to submit an error report, only the report content you enter is sent.
The extension is open source: https://github.com/alike03/SubscriptionInfo