Allow setting of window dimensions in TBB

When looking at https://panopticlick.eff.org I see that my browser dimensions make me fairly unique. It seems that only 1 in 3264810 users have my browser window size.

I'd like to set the Firefox window width to a less specific size, but see no way to pass the "-width nnnn" to Firefox on start-up.

I suggest that the start-tor-browser script and/or Vidalia allow passing of parameters to the Firefox command line.

Trac:
Username: tmpname0901