Note: Minimum requirement is Safari 5.1.
Note: The Safari 7 version requires you to not have Block cookies and other website data set to Always.
Depending on your settings and your version of Safari, you may need to find and open the Filter download in your Downloads folder.
Install: When you see something similar to these:
you must select the “Install” or “Trust” button.
Uninstall and Update: please see the Safari section of the manual.