HAFNOVALink Guard is Hafnova's browser security extension designed to help users detect and block risky destinations directly from the browser.
Powered by Hafnova ThreatDB, it checks visited domains against continuously enriched threat intelligence and helps stop navigation to malicious or unwanted destinations before harm occurs.
Simple to use, lightweight, and completely free, Link Guard brings threat intelligence closer to the user, directly where browsing decisions happen.
Browsing is one of the most common entry points for online threats. Phishing pages, malicious links, fake shops, scam websites, harmful redirects, tracking-heavy destinations, and malicious infrastructure can all appear in normal browsing flows.
Link Guard acts as a browser guard connected to ThreatDB, Hafnova’s threat intelligence platform. Instead of relying on static local lists alone, the extension checks destinations against a live intelligence source and applies protection based on the threat categories that matter to you.
This makes Link Guard a practical extension for:
Link Guard lets you choose which threat categories should trigger blocking. You can configure the tags exposed by your environment and decide what should be allowed or denied based on your own browsing, security, or policy requirements. This makes the extension suitable for a wide range of use cases, from personal security to more controlled browsing environments.
From the toolbar popup, you can manually test a domain and immediately see whether it would be allowed or blocked. This gives users a simple way to validate a destination before proceeding.
If you understand the risk and still want to continue, Link Guard can allow you to proceed. For higher-risk categories such as malware or security-related detections, the extension can require an additional confirmation step.
In situations where a short exception is required, Link Guard can temporarily allow a specific host without permanently weakening your browsing policy.
The browser is still one of the most exposed environments
Link Guard addresses this reality by bringing threat classification directly into the browsing experience. Instead of discovering danger after the fact, users receive a clear decision at the point of navigation.
At the core of Link Guard is ThreatDB, Hafnova’s intelligence platform for domains, malicious infrastructure, phishing activity, abuse patterns, and compromise-related signals.
When you visit a website, Link Guard consults ThreatDB to determine:
This creates a direct connection between domain intelligence and the user’s everyday browsing. It is one more example of Hafnova’s broader approach: bringing threat intelligence as close as possible to real-world usage, through practical and accessible protective layers.
Clear decisions, not silent failures
When a page is blocked, Link Guard displays an interstitial blocked page explaining why navigation has been stopped.
This means users always understand:
The goal is not only to block, but to make browser protection more understandable and more trustworthy.
Simple, fast, and designed for real browsing
When a user visits a destination, the extension checks the hostname against Hafnova’s ThreatDB lookup service. Blocking depends on the selected threat tags and associated configuration. If the service is temporarily unavailable, the extension remains in fail-open mode, meaning browsing continues normally rather than cutting the user off because of a network issue.
This ensures a practical balance between:
Security classification with a clear purpose
To perform threat checks, the extension may send hostnames and related lookup data required for classification to Hafnova’s API. This processing is used for security classification and threat evaluation. Hafnova does not sell user data, and the extension operates within Hafnova’s security and privacy framework.
Users can also review the permissions requested during installation for greater transparency.
Browser security, made practical
Depending on future category exposure and product evolution, this foundation can also support use cases related to:
Link Guard is more than a browser extension. It is a milestone in Hafnova’s product strategy: making security intelligence directly usable at the edge of user activity.
With Link Guard, Hafnova shows once again that threat intelligence does not have to remain buried inside backend systems or enterprise-only tooling. It can be made available in simple, practical formats that help users make safer decisions every day.
This extension is a first step — and a strong one.
Link Guard is designed for users who want:
It is also relevant for organizations that want to expose selected threat tags and help users enforce safer browsing decisions through a simple browser-based control.
Link Guard is completely free. This reflects a simple principle: bringing essential protective intelligence closer to users should not require heavy deployment, complex infrastructure, or paid-only access from day one.
Link Guard helps users stay safer on the web by combining browser security with live ThreatDB intelligence. From phishing protection and malicious site blocking to domain checks and clearer navigation decisions, it brings practical security directly into the browser.