Window Merger is a Firefox extension designed to streamline the process of merging multiple browser windows. Users can easily merge specific windows using a right-click context menu or configurable keyboard shortcuts, making it a versatile tool for those who prefer keyboard navigation. The extension is particularly user-friendly, offering an accessible interface that integrates seamlessly with Firefox’s existing features, including compatibility with Private Windows to ensure privacy during browsing sessions.

The extension emphasizes simplicity and effectiveness, adhering to a philosophy of performing one task exceptionally well. It also provides customization options and fits well within the browser's aesthetic, supporting dark mode preferences. For users seeking additional tab management capabilities, alternatives like FoxyTab and Duplicate Tabs Closer are suggested, enhancing overall browsing efficiency.