Firefox

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.

Socket added Firefox extension scanning for enterprise customers days after its researchers uncovered 40 malicious extensions stealing crypto wallet secrets.

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

Google will remove every remaining Manifest V2 extension from the Chrome Web Store on August 31, 2026, completing a phase-out that has already disabled uBlock Origin and other legacy ad blockers in Chrome.

Microsoft Edge, Mozilla Firefox, and Google Chrome are each cutting their release interval from four weeks to two, starting in late August and September 2026.

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.

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.