Mozilla Firefox Add-Ons Download Site was Harboring Malware

Mozilla, the organization behind the popular Firefox browser disclosed that two add-ons available for download on its website were vectors for Trojans that could compromise users’ computers. Add-ons allow users to extend and enhance the capabilities of Firefox beyond the default install. Normally they are scanned for malware before being uploaded onto Mozilla’s website, but apparently two of them managed to slip through Mozilla’s automated scans. The infected add-ons are Version 4.0 of Sothink Web Video Downloader and all versions of Master Filer.

Mozilla has since updated their scanning process, but as part of our ongoing security watch we are vigilant in continuously protecting our customers under our Managed Services program from malware – you can rest easy.

When managing your systems on your own, it’s highly advisable to be vigilant with security and always use antivirus software – even when downloading and using software from legitimate sources. If you have downloaded these Firefox add-ons, uninstalling them does not remove the trojans that they carry, and you’ll need to use antivirus software to remove any malware on their system. Need more information or help? Call us and we will be glad to assist you.

Related links:

• Mozilla Firefox hit by malware add-ons (zdnet)
• Trojan Horse Mozilla Firefox Addons (the firefox extension guru’s blog)
• Mozilla admits Firefox add-ons contained Trojan code (sophos)