Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.

Trojan detected in Firefox setup

  • 5 uphendule
  • 0 zinale nkinga
  • 6 views
  • Igcine ukuphendulwa ngu James

more options

Hello, I got a Trojan detected when I just updated Firefox. See attachment for details.

Hello, I got a Trojan detected when I just updated Firefox. See attachment for details.
Ama-screenshot ananyekiwe

All Replies (5)

more options

You can ignore the Wacatac.B!ml trojan if you downloaded Firefox from the Mozilla server as we have seen more reports about Microsoft Defender reporting this trojan and this is likely a false positive. If you didn't download Firefox from the Mozilla server (what you always should do), but clicked a link on a webpage or in a pop-up then you should remove this file to avoid getting infected.

more options

Where did you download Firefox from?

Downloading Firefox setup from mozilla.org like say https://www.mozilla.org/firefox/all/#product-desktop-release does not have random numbers as part of file name as it would be say Firefox Setup 117.0.1.exe

more options

James I haven't downloaded Firefox for years. This was Firefox itself performing a regular update. I'm running Firefox 102.15.1esr (32-bit).

more options

Official automatic updates don't use a setup executable or place anything in the Downloads folder.

more options

Yes the internal updates in the official builds of Firefox for Windows, macOS, and Linux uses .mar files.

And as I said those are not normal Firefox setup .exe names with the random numbers on end in your image.

If you were to download Firefox 102.15.1esr for Windows from mozilla.org like https://www.mozilla.org/firefox/all/#product-desktop-esr the file name would be Firefox Setup 102.15.1esr.exe for example.

Okulungisiwe ngu James