Tor Browser

Glassbox Tool Exposes Browser Fingerprinting Risks and Limitations of Incognito Mode

Developer and security researcher David Dale has released Glassbox, an open tool that runs over 30 browser fingerprinting checks to show how identifiable a user appears to trackers. The service evaluates Canvas, WebGL, installed fonts, WebAssembly functions, available APIs, third-party authentication state, and audio processing characteristics entirely in the browser. Results include raw test data and an identifiability score capped at roughly 33 bits, sufficient in theory to single out one person among the global population. Tests reported by The Register showed Chrome at 99 percent identifiability, Firefox at 89 percent, and Tor Browser at 56 percent, though these figures rely on a mathematical model rather than real-world visitor databases. Dale warns that overly hardened configurations can increase uniqueness and recommends using Tor or VPN together with WebRTC leak prevention to blend into larger anonymity sets.

Browser Privacy Ranking 2026: Tor Browser Leads at 9.5 While Chrome and Yandex Rank Lowest

SecurityLab.ru has published a detailed 2026 browser privacy ranking that evaluates major browsers across six criteria including initial network behavior, site isolation, fingerprint resistance, funding model, configurability, and code auditability. Tor Browser scores highest at 9.5 for its comprehensive protections including unified fingerprinting and layered JavaScript controls, followed by Mullvad Browser at 9.0 and LibreWolf at 8.5. Brave earns 7.5 for built-in tracker blocking but faces criticism over default telemetry and cryptocurrency features. Firefox scores 6.0 out of the box yet reaches 8.5 after extensive configuration, while Google Chrome, Microsoft Edge, Opera, and Yandex Browser occupy the bottom positions due to persistent tracking mechanisms and closed-source components. The report also highlights the Local Mess localhost tracking technique used by Meta and Yandex that bypassed browser isolation entirely.

Firefox JIT Vulnerability Exposes Tor Browser Users to Remote Code Execution

A high-severity flaw in Firefox's SpiderMonkey JavaScript engine allows remote code execution simply by visiting a malicious page, directly impacting Tor Browser users on unpatched versions. Registered as CVE-2026-10702, the vulnerability stems from incorrect memory handling in the JIT compiler that leaves a dangling reference to freed memory, enabling arbitrary read and write primitives. Researchers demonstrated successful exploitation that can compromise the browser's content rendering process and facilitate user deanonymization or OS-level attacks. The same issue served as the initial stage in the IonStack exploit chain against ARM64 Android devices, where it was chained with CVE-2026-43499 in the Linux kernel to achieve root privileges. Mozilla addressed the issue in Firefox 151.0.3, and the Tor Project rolled out corresponding fixes in Tor Browser 15.0.19, which also incorporates the latest Firefox ESR updates.