All Firefox users are being encouraged to download a security update for the popular open source browser.

The update includes several fixes to guard against spoofing and arbitrary code execution, and improves stability, said The Mozilla Foundation.

The Firefox security update - Firefox 1.0.1 - is available for the 25 million users who have already downloaded the free browser.

The Mozilla Foundation said that it "encourages all users to download the update", which is available here.

"Regular security updates are essential for maintaining a safe browsing experience for our users," said Chris Hofmann, director of engineering at Mozilla.

"The Mozilla Foundation has developed a community of users and developers who continuously provide feedback on Mozilla software, and as a result of that constant vigilance we are able to provide quick and effective responses to security vulnerabilities."

Mozilla said that it evaluates security issues on an ongoing basis and will issue security updates "as warranted". More information is available in the release notes here.