Weird screen sizes reported by Panopticlick

When I go to https://panopticlick.eff.org/index.php with TorButton (1.4.5.1) Panopticlick reports (among other things):

  Screen Size and Color Depth          1150x600x24
  bits of identifying information      14.67
  one in x browsers have this value    26138.95

but if I go without TorButton it reports:

  Screen Size and Color Depth          1280x800x24
  bits of identifying information      3.9
  one in x browsers have this value    14.94

I would suggest that the default settings for the non TorButton report are far more anonymous than the TorButton report.

I would suggest changing TorButton to use the default screen size and resolution rather than a modified version.

I have already started work on this.

Trac:
Username: erikd