Firefox security warning: Several browser add-ons have been found to be riddled with malware, so be on guard

• Koi Security discovered 17 malicious Firefox extensions that concealed backdoors and tracking code, downloaded more than 50,000 times.
• The extensions extracted payloads from remote servers, hijacked affiliate links, injected trackers, stripped security headers, and activated ad fraud mechanisms.
• Mozilla has removed all affected add-ons and updated detection systems; users should uninstall them and secure accounts

More than a dozen Firefox extensions have been found to be malicious, implementing backdoors and keeping track of users’ browsing habits, experts have warned.

That’s according to security researchers at Koi Security, who named the campaign “GhostPoster” and said some of these extensions have a rather unique way of harvesting malicious code.