maximized window gets resized with Tor enabled

Hi, when I maximize (with my window manager) firefox, here is what I get: http://img503.imageshack.us/img503/8113/screenshotnontorxw6.png

but when I maximize it with tor enabled, here is what I get: http://img68.imageshack.us/img68/8116/screenshottorbk3.png

You can see that the bottom of the window does not appear. It looks like window's height is too big. I've never experienced that behaviour before.

[Automatically added by flyspray2trac: Operating System: All]

Trac:
Username: arno