Window Titler is a Firefox extension that allows users to personalize their browsing experience by modifying the titles of their windows. This tool can label windows and profiles with custom titles, making it easier to identify different tasks or projects at a glance. Users can invoke the extension through a toolbar button or a keyboard shortcut (Ctrl+Alt+T) and can easily manage settings through the extension's configuration page to set profile titles.

Additionally, Window Titler requires the 'Access recently closed tabs' permission to ensure that custom titles remain persistent across browser restarts. While the title bar is disabled by default in Firefox, users can enable it for better visibility. This open-source extension encourages community feedback and contributions, enhancing its functionality based on user input.