seems to work well, but would like an option to customize formating. Like i'd like to add a custom spacer and move the title after the URL

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...

For me save list does not work. After entering a name and clicking "validate" nothing happens.

Tried different ways with and without the title copying to the clipboard.

Also an Option for only selected tabs to copy would be nice, like FoxyTab does it.

Links are not made clickable and headers are not highlighted.

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.