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theregister.com

Firefox 156 released amid browser fork surge

The gist

Mozilla released Firefox 156 on September 15, 2026, speeding up PDF loading by up to 45%.
The update lands as Mozilla's faster release cycle pushes users toward alternative browser forks.

How it unfolded

  1. Sep 14, 2026Mozilla published the final builds of Firefox 156 ahead of the official unveiling, making them available on its FTP server.
  2. Sep 15, 2026Firefox 156.0 was released on the Release channel with faster PDF loading, lower resource use for large JPEG images, a new macOS startup setting, and fixes for browser, media, network, and Windows problems. Mozilla Foundation Security Advisory 2026-90 was also announced with a high impact rating.
  3. Sep 16, 2026The macOS version gained a setting to automatically open Firefox when the Mac starts up, the built-in PDF viewer's startup speed increased by up to 45%, and bugs related to picture-in-picture subtitles and split view were fixed.

Sources

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