Torbutton, CSS3 and window size

[Just A. User]

I use a recent (3.6) FF with the stable Torbutton. javascript.enabled is
set to false.
I have encountered the following issue.

In my prefs.js, I have no extensions.torbutton.resize_windows option
described in the Torbutton
Design Document. That's strange. Moreover, it seems the resizing
functionality does not work as
I expected:
Probably employing some CSS techniques, the tests at

http://what-is-my-ip-address.anonymous-proxy-servers.net

are able to discover the browser's window inner dimensions accurately.

The font downloading attack (@font-face based) from that test is also
successful.

Is the behavior described normal or expectable? If it is, are there any
plans to toughen TB against those
attacks?

Please explain this weird stuff to me.
Thanks in advance.



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