Honestly, I don't have an answer for your question.
Swiftfox is swift
You put it in your /usr/lib folder and extract it with
tar jxvf swiftfox-<version>.tar.bz2
(change the <version> with whatever you have.)
Then make a shortcut on your Desktop to /usr/lib/swiftfox/swiftfox
It will not mess with any rpm's you have or your firefox profiles. To make yourself feel safe, you can backup your firefox config directory. It is the .mozilla directory (with the '.' in front) in your home folder.
EDIT: I now saw an installer in the swiftfox home page. I never tried it. But I can say, it works my way