Debian Linux Security Advisory 2075-1 - Several remote vulnerabilities have been discovered in Xulrunner, a runtime environment for XUL applications.
092cd6fcae7be8a7336bf071b7e24a49ce0e54b973c54ce339cf692b2a748f70
Ubuntu Security Notice 957-1 - Several flaws were discovered in the browser engine of Firefox. If a user were tricked into viewing a malicious site, a remote attacker could use this to crash the browser or possibly run arbitrary code as the user invoking the program. Various integer overflows and other issues have also been addressed.
102cde32fa8d891e54788fea852e8b6a825b5afe8a3b7b8afa40b6db0cea7fcf