Vulnerability prevents the user to using Firefox browser

Firefox browsers for Mac and Windows have recently become targets of some malicious website attacks, which display false warning notifications and completely lock up the browser. Hackers use a bug in Firefox to tamper with the browser to achieve their goals without user interaction. Mozilla has not announced a solution, but the problem has caused serious damage and caused problems for users.

The bug was reported to Mozilla by security researcher Jérôme Segura from Malwarebytes, who warned that the vulnerability could be exploited through specially crafted JavaScript. Hackers can pretend to be technical support sites, warning users that they are currently using pirated Windows systems.

The only way to close the window is to force-close the entire browser using either the Windows task manager or the Force Close function in macOS. To resolve the problem, users must force-close Firefox and then, immediately upon restarting it, quickly close the tab of the scammer site before it has time to load.