Sept 9 news ..
While it was first discovered on Sept 6 .. it was officially announced on Sept 8 with the patch available Sept 9 .. nice work !! The Mozilla Foundation is aware of a potentially critical security vulnerability in Mozilla and Firefox browsers’ support for IDN, as reported publicly on September 8.- as listed on mozilla security page
Mozilla have this listed as critical.
instructions on update available here according to zdnet new firefox and mozilla releases due soon Hackers work to exploit latest Firefox flaw-zdnet