Smart bookmarks are great, but having many of them on toolbars can take up
a lot of screen space. My proposed solution is to have a "smart bookmark
folder". This would look exactly like a smart bookmark on a toolbar, but
the button on the left of the search text box is a folder, not a bookmark.
A user could type a string to search for in the box and then click the
button. Since the button is a folder, a drop-down menu will reveal all the
smart bookmarks inside the folder. The user can then choose which smart
bookmark to apply the text to for searching.

This proposal will only take up the screen space of one smart bookmark, yet
it can be linked to (theoretically) any number of smart bookmarks. Why have
multiple text boxes?