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Mozilla has blocked a Firefox plugin from Microsoft, saying that it presented a security risk to its users.

Microsoft shipped the Firefox add-on as part of a .Net software update last February, causing outrage among some Firefox users, who complained that the software had been sneaked onto their systems without their knowledge or approval and was extremely difficult to remove.

Last week, Microsoft warned that Firefox users who have not applied a recent Internet Explorer patch were vulnerable to a "browse-and-get-owned attack" because of a bug in the Microsoft .Net Framework Assistant add-on.

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"All that is needed is for a user to be lured to a malicious website," Microsoft said. Triggering this vulnerability involves the use of a malicious XBAP (XAML Browser Application).

The flaw is a nasty one, but users who have installed last week's MS09-054 IE update, are protected from this attack, "regardless of the attack vector," Microsoft said.

To protect users who may not have installed Microsoft's patch, Mozilla is automatically blocking two add-ons: the Microsoft .Net Framework Assistant and a related plugin called the Windows Presentation Foundation. 

"Because of the difficulties some users have had entirely removing the add-on, and because of the severity of the risk it represents if not disabled, we contacted Microsoft today to indicate that we were looking to disable the extension and plugin for all users via our blocklisting mechanism," wrote Mozilla vice president of engineering Mike Shaver in a blog posting. "Microsoft agreed with the plan, and we put the blocklist entry live immediately."

Buggy plugins are a growing problem, as cyber criminals have increasingly leveraged flaws in products such as Adobe Flash Player and QuickTime to launch browser-based attacks. Last week, Mozilla launched a Plugin Check site where Firefox users can see if their plugins are up-to-date

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