Firefox users need to update their browser software again after the discovery of yet another security hole.
Only last month users of the open source browser from the Mozilla Foundation were asked to update to version 1.0.1, after Mozilla issued a patch to counter a security hole that opened users up to phishing attacks.
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Mozilla now says Firefox users should upgrade to 1.0.2 to fix the potential threat of a buffer overflow attack as a result of opening Gif images containing rogue code.
The flaw was discovered by security appliance and software company Internet Security Systems.
Chris Hofmann, director of engineering at the Mozilla Foundation, said, "We must stay ahead of the curve in patching potential vulnerabilities. The bug patched in this update has no known real-world exploits, and we were able to provide a quick response."
Mozilla says Firefox has been downloaded 30 million times since its release last year.
The patch can be downloaded from: