Z History Dump is a free Chrome extension developed by Giuliano Procida (CWS) in the Browsers category. It falls under the subcategory of Add-ons & Tools. This extension allows users to collect and download their Chrome history in a machine-readable format.

Upon installation, Z History Dump enumerates all machine-local history URLs and visits available within the 90-day window that Chrome preserves. It stores this information in a local IndexedDB table. The extension also listens to onVisited events to add new visits to the table and onVisitRemoved events to mark visits as deleted.

When clicked, Z History Dump creates a JSON blob that can be downloaded with a single click. The JSON format closely follows the chrome.history HistoryItem and VisitItem types.

It is important to note that Z History Dump does not send or receive any information. It solely performs the functions described above and logs some messages to the JavaScript console.

Overall, Z History Dump is a useful tool for users who want to download and analyze their Chrome history or cross-check other extensions. However, if you do not have a specific need for this functionality, this extension may not be necessary.