Saving a nautilus search seems brilliant, as described in http://www.howtogeek.com/117494/7-ubuntu-file-manager-features-you-may-not-have-noticed/
But on my Ubuntu 16.04 the search is not executed. Instead the file is opened in Firefox.
When executed from the command line
> nautilus NEF.savedSearch
another instance of nautilus is opened instead of the search being executed.
This is the contents of the XML file generated after having saved the search:
;<?xml version="1.0" encoding="UTF-8"?> <query version="1.0"> <text>nef</text> <location>Desktop/Exif</location> </query>