Mozilla, the maker of the open source Firefox browser, is redoubling its efforts to check user created add-ons for viruses and Trojans after it discovered that a language pack on its official add-on page had been infected for months with rogue code, the organization reported Wednesday.

Anyone who has installed the Vietnamese language pack for Firefox could be in danger of having malicious code in their system. Be sure to uninstall this add-on pack if you have recently installed it - unless you enjoy banner ads and opening up your system for future exploits.

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