mozilla/addon-sdk — pull request #859 by ZER0 (2013-03-15 00:12:52+00:00)
Title: Bug 851320 - private-browsing-supported/test-page-mod fails

Replaced `about:buildconfig` with a more unique URL. The failure is most likely related to another test that open the same URL but with a different private setting. We already had a similar issue, fixed in the same way.