Parallel Lines is a free Chrome add-on designed to streamline tab and window management. It allows users to efficiently organize their browser experience by displaying all open windows and their respective tabs, which can be grouped by website for easy navigation. The tool shows essential information such as tab titles, URLs, and open times, with the active tab prominently listed first. Users can also benefit from mouse hover prompts that provide additional context for each tab.

The program features robust window management capabilities, including multi-window and tree modes for organizing tabs by URL. Users can create and manage multiple windows, minimize or delete them, and even create new tabs in specified windows. The ability to drag tabs between windows and delete selected tabs in batches further enhances usability, making Parallel Lines an invaluable tool for anyone looking to improve their browsing efficiency.