Mozilla admits Firefox add-on false alarm

Graham Cluley
Graham Cluley
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Firefox
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”.

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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.


Graham Cluley is an award-winning keynote speaker who has given presentations around the world about cybersecurity, hackers, and online privacy. A veteran of the computer security industry since the early 1990s, he wrote the first ever version of Dr Solomon's Anti-Virus Toolkit for Windows, makes regular media appearances, and is the co-host of the popular "The AI Fix" and "Smashing Security" podcasts. Follow him on Bluesky and Mastodon, or drop him an email.

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