Sounds like it came from Microsoft.
I am not a big fan of Microsoft either, but lets face it, when they had 80+% of the market they had 95% of the hackers looking to exploit them. Now that people have a decent choice and more and more of us switch then these other companies are finding out what its like to have thousands of people hacking their code instead of a dozen. People start seriously hacking hard enough and they will find close to as many vulnerabilities in Mac and FF, just watch the number of patches keep rising.