Mozilla Introduces Quarantined Domains Feature to Protect Users from Malicious Add-ons

Mozilla developers have recently announced the introduction of a new Quarantined Domains feature to protect users from malicious add-ons. The feature is designed to block certain add-ons from running on certain sites for a variety of security reasons.

What is the Quarantined Domains Feature?

The Quarantined Domains feature was introduced in Firefox 115.0 and is designed to protect users from malicious add-ons that could be used by attackers. The feature allows Mozilla to prevent malicious attacks on certain domains, in cases where there is reason to believe the existence of malicious add-ons that have not yet been detected.
Starting with Firefox version 116, users will have more control over the settings of each addon. Users can disable the feature by opening about:config in the address bar and setting the extensions.quarantinedDomains.enabled parameter to false.

How Does the Quarantined Domains Feature Work?

The Quarantined Domains feature complements Mozilla’s existing ability to remotely disable certain add-ons that pose a risk to user privacy and security. However, security researchers have found that in the current implementation, prohibition warnings appear only in the Extensions pop-up window, and are not associated with the Extensions icon. As a result, when pinning an addon to the toolbar, warnings are not displayed.
Mozilla has assured that they intend to improve the function in future versions of the browser, although no specific dates have been given.