This session manager works really well.
It can be left running in the background for a very long time. And if you're a person with many tabs and windows open simultaneously this tool will make your online life much more comfortable and less stressful.
And many of us have spent much time each time the computer needs a restart and we need to bookmark all tabs and windows.
This tool solves this easily with just one click.
I personally pair this addon with the addon called "Snap Links Plus" for a very powerful combo to be able to open many links into tabs, and then just bookmark them all before starting a research session.
Say for example you need to do research on a big dataset over at NASA for the latest data and images from Mars.
Snap the links, save the session. Next time you open up the session everything is where it was last time. Very powerful!
Big thanks to the creator of this addon! =)