DynamicHistory is a subscription-based Firefox add-on designed to automatically manage browsing history by removing entries based on specific criteria. Users can set up filters to exclude history from pages containing designated keywords, such as 'bad-history'. When a page is filtered, it is visually marked with a red border and highlighted tab, providing immediate feedback to the user. This feature ensures that sensitive or unwanted browsing activities are not retained in the history, enhancing user privacy.

The add-on allows for customizable filter adjustments in its preferences, enabling users to tailor their experience according to their privacy needs. Additionally, the 'Always Clear' domain filter can erase previous history on specified domains, ensuring a clean slate for future visits. However, it is important to note that cookies and cache data will remain unaffected, and users are advised to periodically review their history for comprehensive privacy management.