folders for saved links

[B4dWo1f]

Hi,
First of all, the add-on is awesome. Great job!!

I think that it would be really helpful to be able to group the saved links in folders inside the reading list.

In my case I usually have a number of links to read for different topics/projects. 5-10 links for 3-4 projects are already 15-40 links. Finding the relevant link would be much easier if it were possible to organize them in folders...