Malware disguised itself as an update to the Firefox browser that needed a click to activate but otherwise looked normal. Malware was actually a new variation of the Kovter malware, which made a name for itself by hijacking machines and executing remote, sophisticated campaigns. Mozilla has advised users not to disable automatic updates in Firefox. The malware may become more prevalent for malware as cybercriminals search for new installation techniques. Luckily, simple checks and security measures can defeat it. Firefox will manually check for updates when requested, but users should always verify whether the update is real.”]
Source: https://securityintelligence.com/news/firefox-malware-poses-as-browser-update/