ROBOTANK There's no need to revert just because you can't automatically import favourites. In my case, the favourites were carried over. However, even if they weren't (that is, if the uninstaller removed them), all you need is a very simple manual process. Before uninstalling the old version, move or copy the file ~/Library/Application Support/Safari Cookies/Favorites.plist to your desktop or wherever, so it doesn't get uninstalled. After installing the new version, simply move the file back to its original location, replacing any newly created favourites file.
(Version 1.0)