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, it serves as a "legacy" browser for users who cannot upgrade their operating systems. Official Download Links

This version supports "legacy" add-ons that were phased out with the introduction of Firefox Quantum (version 57). firefox version 52.9. 0 esr download

Hospitals, financial institutions, and manufacturing plants often rely on internal web apps that use or Microsoft Silverlight . When Mozilla removed NPAPI support in Firefox 53, these applications broke. Organizations deliberately stay on Firefox 52.9.0 ESR to keep these mission-critical systems running while they slowly transition to modern alternatives. , it serves as a "legacy" browser for

For everyone else: Instead, install the latest version of Firefox (or Thunderbird's latest ESR, currently version 115 or 128) to keep your data safe and enjoy the modern web. firefox version 52.9. 0 esr download