Winestripe Realfox is a skin that makes Firefox 3 look like Firefox 1.5. Remember the cute skin it was... simply amazing. With this skin, the interface, the tabs, and the download manager were reskinned to look like Firefox 1.5. Useless stuff cluttering the address bar, like the Bookmarks star, the RSS icon and the Go Button have been removed in order to simplify the interface. The ugly green security bar has also been removed.
If you don't want all these modifications, use the the Winestripe Modern skin instead.