Window Resizer is a Firefox addon designed to enhance your window management experience. It allows users to easily resize and reposition their current browser windows to predefined or custom layouts. With 20 predefined layouts available, users can quickly select their preferred size and position through a simple toolbar popup interface. Additionally, for those who require a more tailored setup, the addon offers an option to create custom layouts by dragging the desired dimensions within a designated area and saving the configuration for future use.

The toolbar popup UI is user-friendly, featuring draggable icons that let users rearrange their layouts effortlessly. Any changes made to the layout order are automatically saved, streamlining the workflow. Overall, Window Resizer proves to be a valuable tool for users looking to customize their browsing environment without the hassle of manual adjustments.