Jira Ninja is a free Chrome extension developed by jason.f.leong that aims to simplify the navigation experience in JIRA. This extension is specifically designed to interact with the DOM while navigating through JIRA.

The main purpose of Jira Ninja is to address the issue of cluttered boards in JIRA projects that pull in tasks from other projects. With this extension, users can easily collapse all sprints when in the backlog view. This feature allows users to focus on the tasks that are relevant to their project, without being overwhelmed by an excessive number of sprints that they don't need to track.

Jira Ninja provides a convenient solution for JIRA users who want to streamline their workflow and improve their productivity. By simplifying the navigation process and reducing visual clutter, this extension enhances the overall user experience in JIRA.