PSNM is an open-source extension that enables you to view personal data in the browser using a PSNM token. The de-pseudonymization is achieved by sending the request through a public API key and storing the result in a local cookie. When the user clicks on a hyperlink that invokes a function on the extension, the request is sent to the server through a public API key. The server returns the de-pseudonymized data and the result is stored in a local cookie. This allows the user to view the data in the browser in the pseudonymized format. In addition, the data can be shown in other formats, such as PDF or CSV. The data in the cookie is stored in a local cache and is deleted from the browser when the user quits the browser.

The PSNM extension runs as a background task and does not appear in the browser. When the user clicks on the "Save to File" or "Export to CSV" buttons in the menu, the data is downloaded in a text file or a CSV file.