Panic Button is a subscription-based Firefox extension designed to enhance user privacy by quickly concealing browser activity. With a single click of a toolbar button or by pressing F8, users can hide all open browser windows and replace them with a specified URL. This feature is particularly useful for maintaining discretion in various environments, such as workplaces or educational settings. The extension allows customization of the toolbar button's appearance and provides several functional options, including minimizing all windows or closing the browser completely.

The extension supports multiple actions tailored to user preferences, ensuring flexibility in its operation. Notably, Panic Button does not function if Firefox's history settings are set to 'Never remember history,' and certain limitations exist regarding the restoration of specific tabs. Additionally, ongoing downloads will continue in the background unless all windows are closed. Panic Button is available in English and Polish, with opportunities for user-contributed translations.