Interesting; it seems that the two attributes - at least for the three browsers that I regularly use (FF4, Opera 11, IE9) - that are the most unique are (1) the browser plugin details that are sent in the HTTP headers, and (2) the number of system fonts sent in the HTTP headers.
Other than that, the user-agent string is the next most unique attribute, but it differs among the three; for FF4 it’s not that rare (guess that means a lot of folks switched to FF4 pretty quickly), for Opera it’s a more unique attribute - probably because a lot fewer people use Opera, and for IE9 it’s a very unique attribute, most likely because IE9 is so new and because IE users tend to be slower at upgrading - particularly enterprise users - than FF users or Opera users.
I think I might explore how to stop the browsers from sending out so much info on things that are relatively irrelevant, like system fonts.
Hi, Oceander... When you figure it out, and if it wouldn't be too much trouble, would you kindly summarize what you've found so that all Freepers can make the necessary changes? Again, only if you have the time. I know I sure haven't deciphered it yet and would greatly appreciate a nice, easy to understand primer. Thanks!