I looked at a couple of apps on MacUpdate, and they seem to show no more than the URLs of the websites you've visited.
There may be a pertinent app, but I'm unaware of it.
I gather that Safari, unlike Firefox, does not allow examination of cache(s).
In Firefox I just enter about:cache in the URL window and thereby gain access to complete descriptions of each and every cached item.
Every cookie (and subordinate cookies) in Safari (as in Firefox) should be viewable and manageable in a straightforward manner.
It's unclear to me why there should be a problem here.
