FF

Mozilla Firefox 153.0

152.0.6โ†’153.0SecurityFeatureBug fixPerformance
๐Ÿ“… July 21, 2026๐Ÿ—‚ Browsers๐Ÿ“ฆ Mozilla Firefox โ†—๐Ÿ“œ Full changelog โ†—
โœฆ Editor's summary

Firefox 153.0 introduces new browser features, performance optimizations, web platform improvements, and multiple security fixes. The release also includes developer enhancements, compatibility updates, and stability improvements across supported desktop platforms.

โš  Security impact
  • Fixed multiple security vulnerabilities, including memory safety issues identified through internal audits and external security research.
  • Resolved vulnerabilities affecting web content processing and browser isolation mechanisms.
  • Updated bundled third-party libraries to address known security issues where applicable.

What's new

  • Introduced new browser features and user experience improvements.
  • Improved overall browser performance and page responsiveness.
  • Enhanced compatibility with modern web standards and APIs.
  • Updated Developer Tools with debugging and inspection improvements.
  • Fixed multiple stability issues and browser crashes.
  • Resolved compatibility issues affecting websites and web applications.
  • Included various security fixes and platform updates.
More from Mozilla Firefox
Mozilla Firefox 152.0.6SecurityBug fixJul 15, 2026
Mozilla Firefox 152.0.5Bug fixJul 7, 2026
Latest in Browsers
Microsoft Edge: Microsoft Edge 150.0.4078.83SecurityBug fixPerformanceJul 17, 2026
Google Chrome: Google Chrome 151.0.7922.34Bug fixPerformanceJul 15, 2026

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