Firestore Utils is a Chrome extension developed by hardly.hacking. It falls under the category of Browsers and is specifically categorized as an Add-ons & Tools program. This free extension aims to solve the challenge of saving dates in Firestore by converting fields ending in "Millis" to ISO date formats.

When working with Firestore, saving dates can be a cumbersome task. While you can save dates as raw Date objects, this format is not compatible with BigQuery. Alternatively, you can save dates as raw epoch milliseconds, but this format is not very human readable.

With Firestore Utils, you can automatically convert fields ending in "Millis" to ISO date formats without modifying the actual value. This means that while the value remains the same, you can now more easily understand Firestore values.

By using this Chrome extension, developers and users can save time and effort in dealing with the complexities of date formatting in Firestore. Firestore Utils simplifies the process and enhances the readability of date values in Firestore, making it a valuable tool for anyone working with Firestore.