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Firefox ESR (Extended Support Release)

Personal productivity and utilities · by Firefox

Extended Support Release build of Firefox for users on older operating systems no longer supported by the standard release, available as 64-bit and 32-bit downloads.

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What it does

Extended Support Release build of Firefox for users on older operating systems no longer supported by the standard release, available as 64-bit and 32-bit downloads.

  • Private web browsing
  • Tracker blocking
  • Cross-platform browsing synchronization
  • Enterprise browser deployment
Category
Personal productivity and utilities
Users
General consumers, Enterprise users
Public API
Not offered

Not yet disclosed: deployment options, platforms, languages and support channels.

Pricing

  • Free plan$0

Prices as published by Firefox, checked Oct 2026.

Security and compliance

As reported by Firefox. Ask for audit reports before you buy.

  • Enhanced Tracking Protection (ETP) — automatic cross-site tracker blocking
  • Total Cookie Protection (TCP) — cookies locked to originating site
  • End-to-end encryption for sync data (history, bookmarks) before leaving device
  • Private Window mode — deletes session data on close, blocks tracker scripts, fingerprinting protections, opt-out of data sale/sharing
  • On-device AI models — data stays on user's device for Link Previews and Smart Tab Groups
  • Third-party AI chatbot isolation — Mozilla has no access to user chats with chatbot provider
  • Privacy-first ad architecture — prevents advertisers from learning user identity
  • Manifest v2 extension support for ad blockers
  • Data encrypted by default across desktop, mobile, and tablet

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