From zdnet.com
![Firefox MitM page](https://zdnet3.cbsistatic.com/hub/i/2019/02/01/78d4131c-7e40-4abd-b3a2-c7d42c548fb9/2bc67b2c44f408050b7fe957d9fe55f6/firefox-mitm.png)
The Firefox browser will soon come with a new security feature that will detect and then warn users when a third-party app is performing a Man-in-the-Middle (MitM) attack by hijacking the user’s HTTPS traffic.
The new feature is expected to land in Firefox 66, Firefox’s current beta version, scheduled for an official release in mid-March.
The way this feature works is to show a visual error page when, according to a Mozilla help page, “something on your system or network is intercepting your connection and injecting certificates in a way that is not trusted by Firefox.”