Mozilla sent Firefox Version 53.0 to the release channel today. The update includes a massive 35 security updates identified as eight (8) Critical, sixteen (16) High, seven (7) Moderate updates and four (4) low security updates. Firefox ESR was updated to version 45.9.0.
The next scheduled release is June 13, 2017 (5 week cycle with release for critical fixes as needed).
Mozilla Firefox Release Notes
Security vulnerabilities fixed in Firefox 53 — Mozilla
The next scheduled release is June 13, 2017 (5 week cycle with release for critical fixes as needed).
Mozilla Firefox Release Notes
Security vulnerabilities fixed in Firefox 53 — Mozilla