PUM.Optional.FireFoxSecurityOverride

Short Bio

This is detection for potentially unwanted modifications (PUMs) in the Firefox security settings. These changes disable the Safe Browsing feature or enable the viewing of mixed content. As a result, users are made vulnerable to sites may harbor insecure or potentially malicious content.

System Modifications

The following strings are modified in user.js:

From:
user_pref("browser.safebrowsing.enabled", true);

To:
user_pref("browser.safebrowsing.enabled", false);

From:
user_pref("browser.safebrowsing.malware.enabled", true);

To:
user_pref("browser.safebrowsing.malware.enabled", false);

From:
user_pref("browser.safebrowsing.downloads.enabled", true);

To:
user_pref("browser.safebrowsing.downloads.enabled", false);

From:
user_pref("security.mixed_content.block_active_content", true);

To:
user_pref("security.mixed_content.block_active_content", false);

Remediation

Malwarebytes automatically sets the values of the modified strings in user.js to “true” to stop triggering the detection of PUM.Optional.FireFoxSecurityOverride.

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