Does what it says on the tin, but not as useful as I would like. Without an option to add tabs unloaded or suspended, anything above 50 or so tabs will lag you to heck and back. Considering the entire point of loading a list of URLs is because I have a lot of them, this is a bit disappointing.

There is at least one other addon that has a suspension feature and I quickly swapped to that one instead.

It does exactly what it says it will.
Great for saving list of open URLs - and restoring if required.
BUT - all a manual process - Select all - copy - paste into notepad - save

Really nice add on to the utility would be an option to save the list automatically every N minutes.

Probably the simplest method would be to create a .TXT file in a specified folder where the file name includes the date and time of the save.

Best method would be to create a folder of the saved URLs in a specified folder in Bookmarks. new folder name to again include date and time of save.