No troubles like you report and I use Firefox mostly too. However, I did uninstall fairly soon afterward because it just made GC look and feel funny to me. I suppose that in order to make room for the additional rating stars etc each line in a bookmark list, for example, took up a couple of screen lines. Maybe I'm lazy but I did not like having to scroll up and down to find a cache in the list.
Instead, maybe just a single icon on the cache that just indicated that a rating was present and you could click on it or hover over it to see the details. Then maybe the visual and functional experience would not have been so jarring for me.