[diamondsea]

It's more for content you don't control that you want to include in a site. For example, if you want to show the CNN feed within a secure portal page, it will give you the mixed-content warning because of the images in the feed.

Running the RSS feed through FixSSL does some basic remapping of the links so that it routes the images through FixSSL, which prevents the mixed-content warnings from appearing.

Of course, if CNN (and other sites) offered HTTPS versions of their feeds, there would be no need for this, but until they do it serves a purpose.