Bookmarks - Add an Advanced tab

[Stamimail]

Everything has many other editable options that not included in "Edit Bookmark" dialog-box.
Type in Everything searchbar
about:config

For example, I wanted to make a bookmark and set those entries:
name_column_width=
path_column_width=

btw,
Another thing to consider, is saving the current state/settings to memory before switching to a bookmark, to be able to switch back to the former state when pressing again on the bookmark (or its shortcut).

[Stamimail]

The simple way, I thought about creating an advanced tab, with a large text-box, that you can simply copy-paste entries from the INI.
Another way is to make it possible by the file
Bookmarks.csv
This can also do the trick.