I thought i'd post this as it could look like a bit of a contradicition at first glance.
When deleting internet browser history there's an option to 'Preserve Favourites website data'. This will store all information only relating to site stored as a Favourite. The previous screen however, had the 'Delete browsing history on exit' option. The two would seem to contradict each other so i've had a look into it and found that even if you have the 'Delete browsing history on exit' option selected it does not override the 'Preserve Favourites website data'.
I originally thought that it might (what with there being other bugs with current builds) but have only just come to test it so i thought i'd post this to pass on the information.