Mozilla's head of security is to step down at the end of the year.
Window Snyder, who holds the official title 'chief security something-or-other', admitted she has resigned from her position in a blog.
Snyder hasn't yet revealed what her next step will be. She joined Mozilla in 2006 after working as a security strategist for Microsoft. She is currently in charge of improving security in the Firefox web browser and other Mozilla projects.
Security has become more important for Mozilla as its Firefox browser has gained more users, making it a more attractive target for malicious hackers. Just last week it was being targeted by a new Trojan that tries to steal online banking passwords, according to security company BitDefender.
"It's impossible to build a perfectly secure browser," Snyder previously told Computerworld. "That's not the goal. The goal is to build the safest browser we can. It's an ongoing process. It's not a goal where we'll say, 'OK, we're done.'"
In her blog, Snyder said she was leaving Mozilla's security in capable hands, naming several colleagues who will assume her duties.
See also: Beta version of Thunderbird 3.0 released