Mozilla admits Firefox add-on false alarm

Filed Under: Firefox, Malware

As I reported on this blog at the time, last week Mozilla warned that two Firefox add-ons had been found to be infected by malware.

This week Mozilla has updated its blog in order to explain that one of those malware reports was erroneous - and that the detection of a Trojan horse in Version 4.0 of Sothink Video Downloader was in fact a false alarm in the anti-virus product they were using to scan Firefox add-ons.

Of course, you have to feel sorry for the developers of Sothink Video Downloader whose reputation could have been harmed by an incorrect claim of malware infection like this.

I don't think that Mozilla was wrong to withdraw the add-on from availability while its status was under question, but I do think there should have been more checking before publicly labelling it "malware".

Meanwhile, Mozilla has confirmed that the other add-on under scrutiny, Master Filer, was infected by a Trojan and downloaded by fewer than 700 people.

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Graham Cluley runs his own award-winning computer security blog, and is a veteran of the anti-virus industry having worked for a number of security companies since the early 1990s. Now an independent security analyst, he regularly makes media appearances and gives computer security presentations. Send Graham an email, subscribe to his updates on Facebook, follow him on Twitter and, and circle him on Google Plus for regular updates.