According to the notice published on the blog Mozilla, two add-on for Firefox, which for months had been placed in the experimental section, the official site of supplements contain Trojans, identify the main anti-virus products as early as 2008. These malicious programs to install backdoors on machines running Windows and steal user passwords.

As published at the end of last week, the message says that in the case of installation by the user of one of those infected with Trojans addons are activated automatically when you start Firefox and infect the computer. Uninstalling the plug-in will not solve the problem - in order to completely get rid of the infection, will need to undertake a thorough scan of multiple antivirus engines or even reinstall the OS.

Turning to history, we can recall that this is not the first episode of the additions to Firefox. Thus, released in May 2008, the Vietnamese language pack, which has had time to download over 17 thousand people, was also infected with malware, allowing users to unwanted advertising.

At this time the infection was discovered in two addons: Sothink Web Video Downloader and Master Filer, who were amazed intercept passwords Win32.LdPinch.gen and trojan Win32.Bifrose respectively. The first addon has been downloaded more than four thousand times, and the second had time to download about 600 people. The vulnerability only affected users of Windows.

Despite the fact that the signatures of both malicious programs have long been present in all anti-virus databases, scanner, used to verify the Mozilla plugins site, they have missed. In this regard, the company decided to add a chain verification addons two anti-virus scanner.