[fjarlq]

But all major browsers are not targeted with the same vigor. IE is targeted much more vigorously because the criminals stand to gain much more from their efforts than if they target, say, Opera.

Also, Chrome's sandboxing is designed to assume the browser will have exploitable vulnerabilities, so there are two hoops that the exploit must jump through instead of just one. In this latest IE vulnerability there is only the one hoop and then on most machines the exploit has acquired administrator privileges.

[rm-rf]

Because of it's market share? Perhaps.