Those are global figures - in the UK IE still has about 70% of the market; the UK has never embraced Firefox for reasons that escape me. However, that's still a drop of 6%, while Firefox is at 18%. Much of this is down to security scares, greater awareness of other options, use of Safari on iPhones as well I suspect.
This is going to put further pressure on organisations that are still using IE6 as their main operating tool. I understand that in some situations, particularly the NHS there are tools that will only run within that environment, but I still don't see why they can't move to different browsers - I can't believe that people are incapable of working with different bits of software, but I guess I must be wrong in that assumption!