Short bio

This is the detection of several potentially unwanted modifications (PUMs) on user.js, a Firefox browser configuration file, which allows the installation of any third-party add-on or extension to Firefox.

System modifications

The following script value is modified:

("extensions.autoDisableScopes", 15)

("extensions.autoDisableScopes", 14); or
("extensions.autoDisableScopes", 0)


Malwarebytes automatically deletes the user.js file that triggers the detection of PUM.Optional.FireFoxSearchOverride.

Cybersecurity info you can’t do without

Want to stay informed on the latest news in cybersecurity? Sign up for our newsletter and learn how to protect your computer from threats.

Select your language