Mozilla has yet to announce a replacement for Snyder and, for the time being, her attributions will be split between 3 people:
“I will be leaving Mozilla at the end of the year. I am sad to be leaving, but I am excited to go work on something I have always been passionate about. I wish I could tell you about it now, but that will have to wait for a while.
You will still get Mozilla security information here. Johnathan Nightingale, Lucas Adamski, Brandon Sterne and Mike Shaver will all be posting on the Mozilla security blog to keep users informed about security issues and announcements. I leave you in their very capable hands and wish them the best of luck.”
Previous to her joining Mozilla, Snyder had been working for Microsoft as a security strategist and was involved in the Windows XP SP2 project.