Too many tabs or open windows? This add-on enables you to manage your tabs and to create as well as retrieve sessions while still enjoying a simple layout. It is intended for users who have many tabs open in a single or multiple windows and want to organize their workflow around browser windows, whereas each window is dedicated to a topic, issue or project, here denoted as a Session. Now you can name and rename each window, the name will persist over multiple sessions. The user can save all tabs with an absolute URL of the current window as a new Session. After a new Session is added, it can be overwritten by any current window or later be deleted. Individual tabs can be added to Sessions by drag & drop. Main Features

Save all tabs in the window as a session
List all tabs in the current window
Close any tab by clicking on the red x button
Reorder tabs by drag & drop
Move tabs to other windows by drag & drop
Add tabs to existing session by drag & drop
Give each window a name
Switch focus to other window by clicking on corresponding box
Highlight any tab which url is open elsewhere
Customize Add-on's UI by choosing your own colors

The most recent features and changes coming with the last updates can be viewed under release notes on the left hand side (or below) of this webpage. What's ahead? This add-on is free and will remain ad infinitum free for you to use. If this add-on helps you to increase your productivity and serves your needs well, you are welcome to leave a review or to make a small donation by clicking on the heart symbol in the add-on.