Mozilla Firefox before 3.5.16 and 3.6.x before 3.6.13, and SeaMonkey before
2.0.11, does not properly handle certain redirections involving data: URLs
and Java LiveConnect scripts, which allows remote attackers to start
processes, read arbitrary local files, and establish network connections
via vectors involving a refresh value in the http-equiv attribute of a META
element, which causes the wrong security principal to be used.

chriscoulson

jdstrand

Ubuntu 11.04 (Natty Narwhal) has 4.0b7. Fixes will be in 4.0b8.