Mozilla

Mozilla's Firefox 157 brings the Nova visual refresh, a returning compact mode, hardware AV1 decoding in WebRTC, and new CSS support for at-rule() and overscroll-behavior: chain.

Mozilla released Firefox 156 on September 15, 2026, with scheduler and Promise.try fixes, TLS group removals, a roughly 45% faster PDF viewer startup and new enterprise policies.

Mozilla revoked and replaced a GPG signing subkey after an unencrypted copy leaked into a private GitHub repo, finding no evidence of unauthorized use.

Mozilla ships Firefox 151 on May 19, 2026, patching 25 security vulnerabilities and adding PDF merging, Document PiP, Web Serial API, and tighter fingerprinting controls.

Mozilla released Firefox 150 on April 21, 2026, fixing 271 vulnerabilities surfaced by Anthropic's Claude Mythos Preview in a security sweep Mozilla's CTO calls a turning point for defender-side AI.

On April 15, 2026, Mozilla and Google removed DigiCert's legacy G1 root certificates from their trust stores, forcing holdouts on legacy chains to reissue TLS certificates or face untrusted errors.

Firefox 149 routes browser traffic through a proxy network to mask IP addresses, offering 50 GB of free monthly data in four countries with no extension required.

Mozilla releases Firefox 149 with a complimentary browser-only VPN, side-by-side tab browsing, and automatic permission revocation for malicious sites.

Mozilla delivers on its kill switch promise: Firefox 148 adds a single toggle to block all current and future AI features, arriving February 24.