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Some sources or documents need attention: 251/253 feeds/APIs · 0/409 docs · checked 11:21 UTC Customize Public modeDiscuss ChangeIntel on Discord
Preview

Mozilla Firefox Beta

Preview builds, not for production. The newest release is 159.0b1, published 12 Oct 2026.

Publisher's record

What to do

Preview builds are for testing new features, not production. Run the released line where it matters.

Released line Mozilla Firefox ReleaseLatest 158.0 · no end date published
159.0b1Newest release · 2d ago
1Release in the last 12 months

Is your version current?

Compared with the publisher's releases of this line

Releases of Mozilla Firefox Beta

1 collected, newest first
VersionPublishedWhat the notes say
159.0b1 12 Oct 2026—

What changed

First observed 14 Oct 2026

No field changes in the recorded history.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

A day selects the latest observation by the end of that UTC day; today's selection can change until midnight. History starts when this installation records it.

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ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 14 Oct 11:21 UTC · 251 of 253 readable · 250 fully read · documentation 0/409 current

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