The Tor Project has rolled out Tor Browser 15.0.1, a timely update that enhances user privacy and security amid escalating online threats.
Released on November 11, 2025, this version addresses critical vulnerabilities through backported fixes from Firefox, ensuring safer, anonymous browsing for activists, journalists, and everyday users who evade surveillance.
Available for download across Windows, macOS, Linux, and Android, the browser continues to champion a free internet by patching flaws that could expose users to exploits.
Core Security Enhancements and Firefox Integration
At the heart of Tor Browser 15.0.1 lies a robust rebase onto Firefox Extended Support Release (ESR) 140.5.0, which incorporates essential security updates from Mozilla’s advisories.
Developers backported fixes from Firefox 145 to address several high-impact vulnerabilities that plagued earlier versions.
These patches mitigate risks like remote code execution and privilege escalation, common vectors in browser-based attacks.
For instance, the update resolves issues in rendering engines and network handling that adversaries could leverage for deanonymization or data theft.
NoScript, the browser’s trusted extension for script blocking, jumps to version 13.4, enhancing defenses against malicious JavaScript that might fingerprint users or bypass Tor’s onion routing.
Android users benefit from an updated GeckoView to 140.5.0esr, fixing extension update mechanisms that previously failed, ensuring consistent protection on mobile devices.
These changes underscore Tor’s commitment to staying ahead of threat actors, including state-sponsored surveillance, by integrating upstream security without compromising anonymity features.
Usability Improvements and Platform-Specific Fixes
Beyond security, Tor Browser 15.0.1 refines the user experience to make privacy tools more accessible.
Across desktop platforms, the default zoom level now holds steady without resetting to 100%, while the upgrade notification in about: tor displays reliably.
Linux users see restored Noto CJK fonts for better readability in East Asian scripts, addressing a downgrade in the Jigmo font that hampered text rendering.
On Android, build optimizations prevent redundant signing processes, streamlining installations.
The release also adds the “No AI” variant of DuckDuckGo as a search engine option, catering to users wary of algorithmic biases, and sorts engines alphabetically for easier selection.
Build system tweaks, like updating Go to 1.24.10 and refining Android zipaligning, ensure smoother deployments without introducing new vulnerabilities.
This update arrives amid global censorship crackdowns, reinforcing Tor’s role as a digital lifeline.
Users should update promptly to shield against evolving threats. For feedback or bugs, the Tor community welcomes input via official channels.
