Sailfish 4 Browser Features: Vulnerability notification

The new Sailfish 4 website lists several things, among which is this:

Certificate info

Access site security information easily from the address bar and review certificate issuers. Get notified when security vulnerabilities are discovered.

Now, the certificate viewing has been there for a while, and fine.

What is the background to the second sentence? What is the mechanism that checks for vulnerabilities, how is the notification implemented?

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