Simple and efficient !
But what is the Folder in which the saved lists are stored ??
it would be nice to know this, in order to store a copy of these lists...

This is best of all copy/paste tabs list addons.

but,

1. Tabs are open in reverse order when "browser.tabs.insertAfterCurrent" is true. -> thanks for reverse opening order option in new version.

2.addon name is changed to "Copy/Paste and Save tabs list", but toolbar icon label is old "PasteSite" that is not updated.

3.addon toolbar icon color is white, so I can't see it's icon in overflow menu that is white background.

Buttons icons can also be compressed, one by 18 times and the other by 100 times. By 100! This is a small thing, but these little things make up the final size of the addon.
The main icon of the addon is ugly. I would replace it. Even by hand, I can draw better. For myself, I replaced the two square, similar to the copy icon.
It is better to replace the "Validate" button with an icon. For the reason stated earlier.

GitHub is a development tool, not an exhibition of achievements. The code is developed and cleaned on GitHub, and then the end product is displayed in places like this. And not the other way around.

I won't bother you anymore. Do whatever you want. ) The dialogue doesn't work here.