[worklogin]

I once posted to /r/tor (or /r/onions, I forget) that the Tor Browser Bundle leaks the current browser window size ( instead of providing a universal value) thus increasing uniqueness on tools like Panopticlick. Firefox, for the same value, provides screen resolution, not window resolution.

[kiiski]

It seems like the Tor Browser at least pops up a message saying you should leave the window to its original size when you maximize it. It still lets you do it.