I was looking at a baseball score on Yahoo and the page was slow to load.
I noticed that the bottom "notification area" in Firefox said
transferring data from facebook.com
Not only does it trouble me that there is any communication whatsoever between any non-Facebook page and Facebook's servers, this made the page extremely slow (30+ seconds) to load.
Are there any plugins I can run in Firefox to see exactly what is being transmitted to/from the other site? Or are there other ways to figure out what's going on?