Critical JavaScript vulnerability in FireFox 3.5

[Mick]

Have you updated your FireFox to version 3.5 if so there is a problem

Critical JavaScript vulnerability in Firefox 3.5 at Mozilla Security Blog

This link tells you all about it and how to work round it till its fixed

 

[Redash]

It has been fixed in version 3.5.1.
click help, then click about firefox. This will tell you which version you have.

Firefox should have updated itself, mine did so last Thursday.