With the release of Firefox 67, the Mozilla Foundation will make Firefox Monitor available as an add-on by default. For those who don't know, it's currently a standalone service that allows users to find out if their data has been leaked.
This service will be released publicly for all Firefox users and will offer real-time warnings when a user visits a website that has been hacked and data has been leaked.
The feature, although it exists, does not work in Firefox 65 and 66.
According to the bug tracker (#1, #2), users who have already signed up for Firefox Monitor receive a notification about compromised pages. Also, if the website fixed the security holes after the breach and data leak, then the browser will not display notifications.
Enabling the Firefox Monitor add-on in Firefox 65 and 66
Firefox Monitor is already available in Firefox 65 but is disabled by default. To make it work, you need to enable it manually. Let's see how:
Start the Firefox browser and in the address bar type: about:config
An internal page will open. Click the “I accept the risk” button to continue.
Then, in the search bar, copy and paste “extensions.fxmonitor.enabled” and the setting will appear.
You will see that its value is set to False. To change the value to True, double-click on it. This will enable the Firefox Monitor service in your browser.
Restart the Firefox browser.
If you now visit a website that is already on the list of pages that have been hacked by the HaveIBeenPwned service, a notification will appear in the URL bar warning you that the page has been hacked and data has been leaked.
See the full list of websites that use the Mozilla Foundation.
