Windowed Modern does not collect, transmit, sell, share, or remotely process personal information, browsing history, website content, analytics, telemetry, or interaction data.

The extension stores only the user’s selected extension settings and per-website fullscreen mode preferences using Firefox’s extension storage APIs.

Website access is required to intercept fullscreen requests and apply the mode selected by the user. Page content is not transmitted to the developer or any third party.

The extension does not operate an external server or use remote analytics.