Mozilla Firefox Quantum V66.0.5 May 2026

Allows users to authenticate on websites using facial recognition or fingerprints on Windows 10. System Requirements Firefox 66.0.5 System Requirements

Mozilla Firefox Quantum v66.0.5, released on May 7, 2019, was a critical point update primarily focused on resolving a significant bug that caused browser extensions to be disabled. Mozilla Firefox Quantum v66.0.5

As part of the broader Firefox 66 release, this version includes: Allows users to authenticate on websites using facial

Automatically prevents websites from playing sound-enabled media. released on May 7