Hi and thanks for the review.

The thing is I didn't add a delete option the the "Active snapshot" because basically once the auto-save timer is triggered everything will be rewritten so deleting something from there can only work for as long as the auto-save timer is not triggered.
Now... I seriously should add the option to delete some other stuff... like closed windows from there because they can keep stacking up and there's no way to remove them right now.
Also I can definitely add the option you're talking for all the other saved sessions from the History Tab since there those will not be changing at all and you should be able to do whatever you want. I will let it available for the "Active snapshot" as well.. just in case someone wants to save things right after deleting a saved tab but as I was saying if the re-saves is triggered during that time... everything will be there again and I can't really do something about it.

Drag-n-drop was not implemented fully for History sessions but I will try to add support for as many things as possible even there.

Will try to implement this as soon as possible. If you remember about it when using the addon, I hope you will remember about this review as well and update it if it really becomes "a five-star extension" :)

Thanks for using the addon.