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Mozilla security researcher moz_bug_r_a4 reported that web content could receive chrome privileges if it registered for drop events and a browser tab element was dropped into the content area.
This is now public: http://www.mozilla.org/security/announce/2011/mfsa2011-30.html
This issue has been addressed in following products: Red Hat Enterprise Linux 4 Red Hat Enterprise Linux 5 Red Hat Enterprise Linux 6 Via RHSA-2011:1164 https://rhn.redhat.com/errata/RHSA-2011-1164.html