"If, for any reason, developers need persistent storage (e.g., when building a web app that relies on critical data that isn't persisted anywhere else), they can do so by using the navigator.storage.persist() method of the Storage API.

In Firefox, when a site chooses to use persistent storage, the user is notified with a UI popup that their permission is requested.

Safari and most Chromium-based browsers, such as Chrome or Edge, automatically approve or deny the request based on the user's history of interaction with the site and do not show any prompts to the user."