On Monday, Zalewski made note of a new Firefox bug that could give cybercriminals a leg up when running phishing attacks. Firefox can be forced to spawn a window with blank address bar with the Reload button disabled, Zalewski said. "This can be used to evoke a false sense of security or authority in casual users," he wrote in his . Hackers would have to dupe users into visiting a malicious site to pull this off this kind of attack, however.

Mozilla, security vendors and even Zalewski ranked this more recent flaw as minor; Mozilla has not yet patched the problem, and it's unclear whether it will be fixed in the 1.5.0.10 and 2.0.0.2 updates.

Mozilla also said that the week's Firefox updates would include Windows Vista-related changes, including one that allows Vista users to update the browser without having to download and reinstall the entire browser.