Worthless. Did not work for me. Plus it only works with gmail, and cannot be configured to work with Outlook. Cannot even copy all tabs to clipboard.

I needed to save a few hundred tabs... and this addon crushed :DD
I'm disappointed. Ten tabs I can save by myself. Three hundred... unlikely.

It's in the "About this extension" but it should be in the short description: this only works with Gmail.

Didn't work unfortunately. Might be because I'm using Multi-Account Containers and have Gmail set to Always open in "Google" (my container for Google websites).