Firefox ESR (Extended Support Release)

Name: Firefox ESR (Extended Support Release)
Brand: 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 is Firefox ESR (Extended Support Release)?

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.

Product typePersonal Productivity & Utilities

Pricing ·

Deployment

APINot available

What teams use Firefox ESR (Extended Support Release) for

Private web browsing

Tracker blocking

Cross-platform browsing synchronization

Enterprise browser deployment

Integrations and access

Platforms, integrations, and language support vary by plan and region. Confirm final requirements with the vendor.

Platforms

IntegrationsAPI and webhooks

Languages

Support

What reviewers say

Community reviewsReviews are owned and editable by their authors.

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Enterprise readiness

Compliance claims are normalized from current vendor documentation and independently reviewed by SOTA2.

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

Data retention:

Benchmarks and comparisons

Independent benchmarksStructured task results are being verified.

Side-by-side comparisonsComparison workspaces will be available in a later release.

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