Auto Tab Discard is a free browser extension designed to enhance browser performance by reducing memory usage and improving battery life on portable devices. The extension automatically discards inactive tabs, thereby reducing the amount of memory used by open but idle tabs. This lightweight extension disables JavaScript code and DOM events on discarded tabs, and preserves the discarded state of tabs even after the browser is closed and reopened.

The features of Auto Tab Discard include the ability to exclude specific hostnames or regular expressions from auto-discarding, the ability to restore the state of a tab after it is released from being discarded, and the option to force the discarding of specified hostnames. The extension also allows users to configure whether tabs should be discarded based on factors such as whether they are pinned, playing media, or have unsaved content or user input.

In addition to these features, Auto Tab Discard offers a range of plugins, including the ability to release the discarded state of the next or previous tab, automatically discard all newly opened inactive tabs, and permanently delete old discarded tabs that are inactive. Overall, Auto Tab Discard is a valuable tool for anyone looking to improve their browser's performance and reduce memory usage.