The Quantum Safety Browser Extension is an add-on for Firefox designed to help users determine whether their current web session is protected by post-quantum cryptography. It addresses the challenge that existing browsers do not indicate to regular users whether their secure connections employ cryptographic algorithms resistant to future quantum computer attacks, such as the 'store now, decrypt later' threat. The extension provides a visual indicator in the browser toolbar, showing the level of quantum safety for the website open in the current tab.
Developed by Andrew E Scott from Far Phase, the extension visually signals the cryptographic status of a web session: a green tick in the padlock icon means the site is using post-quantum cryptography, an orange question mark indicates uncertainty, and a red stop sign signals that post-quantum cryptography is not in use. Users can hover over the indicator to see which post-quantum cryptography algorithm is being used, with the tool referencing algorithms based on the NIST PQC standard ML-KEM and its hybrid variants. The extension requires permission to access data for all websites and browser tabs in order to provide accurate status, but it does not permanently store or transmit this data from the user’s computer.
0 onwards, as earlier versions do not support the required cryptography standards. Other browsers such as Chrome, Edge, or Safari are not supported due to their lack of necessary extension APIs. The extension is intended for users who access sensitive data online and are concerned about the future risks posed by quantum computers potentially decrypting today's encrypted sessions. It does not guarantee complete online safety, as it only assesses the use of post-quantum cryptography for the top-level page, not for all page components or other potential vulnerabilities.
The tool is positioned as a security platform extension focused on raising awareness and providing transparency regarding the adoption of quantum-resistant cryptographic protocols during web browsing sessions in Firefox.
In the Security & compliance platforms space, Quantum Safety Browser Extension takes a focused approach. Users cannot easily determine if their web sessions are protected by post-quantum cryptography; this extension provides clear indicators. It is built as a consumer product for privacy-conscious web users. The product is available for free. The product ships for the web and embeddable surfaces.
Behind Quantum Safety Browser Extension is Andrew E Scott / Far Phase, and the product first shipped in 2025. Key capabilities include quantum safety indicator, visual connection status, and privacy protection.
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