Meanwhile, a carefully-constructed trick webpage can cause Firefox to execute arbitrary code on any platform (such as, say, installing rootkits or botnet clients). The Mozilla Foundation have patched this, though it's not in the Debian distro yet.
That's my distro of choice, and is used both on dev.null.org and my desktop Linux box.
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It's odd that you would mention debian - is that what you are running? Or is that what dev\null is served from?