This add-on has an excellent feature: it allows saving not only the whole pile of tabs but just picked out ones.

But there're small problems.
1. I have bookmarks laid out in vast and deeply nested sequence of folders, and while saving, the add-on opens a pop-up with those folders expanded. So, I have to scroll a lot and be careful not to miss the desired root folder.
2. The folder where bookmarks are saved is always named by current date and time, the name cannot be customizes.

Please,
1) show in the pop-up top level folders collapsed, so one could easily find and expand the required.
2) add option to set the folder's name WHILE saving rather than AFTER, through bookmarks manager.