# Firefox 157 Beta Released With Latest Enhancements

DevFeed: [Firefox 157 Beta Released With Latest Enhancements](<https://devfeed.tech/articles/firefox-157-beta-released-with-latest-enhancements-26760.md>)

Original publisher: [Read original article](<https://www.phoronix.com/news/Firefox-157-Beta>)

Author: Michael Larabel

Published: 2026-09-15T12:31:03Z

Content type: release

Language: en

Sources: [Phoronix](<https://devfeed.tech/sources/phoronix.md>)

Topics: [Firefox](<https://devfeed.tech/topics/firefox.md>), [Mozilla](<https://devfeed.tech/topics/mozilla.md>), [CSS](<https://devfeed.tech/topics/css.md>), [Nova](<https://devfeed.tech/topics/nova.md>), [Playback](<https://devfeed.tech/topics/playback.md>), [HTML](<https://devfeed.tech/topics/html.md>), [ui](<https://devfeed.tech/topics/ui.md>)

Tags: [audio](<https://devfeed.tech/tags/audio.md>), [css](<https://devfeed.tech/tags/css.md>), [desktop-linux](<https://devfeed.tech/tags/desktop-linux.md>), [firefox](<https://devfeed.tech/tags/firefox.md>), [html](<https://devfeed.tech/tags/html.md>), [linux-benchmarking](<https://devfeed.tech/tags/linux-benchmarking.md>), [linux-hardware-benchmarks](<https://devfeed.tech/tags/linux-hardware-benchmarks.md>), [linux-hardware-reviews](<https://devfeed.tech/tags/linux-hardware-reviews.md>), [linux-how-to](<https://devfeed.tech/tags/linux-how-to.md>), [linux-performance](<https://devfeed.tech/tags/linux-performance.md>), [linux-server-benchmarks](<https://devfeed.tech/tags/linux-server-benchmarks.md>), [mozilla](<https://devfeed.tech/tags/mozilla.md>), [nova](<https://devfeed.tech/tags/nova.md>), [open-source-graphics](<https://devfeed.tech/tags/open-source-graphics.md>), [phoronix](<https://devfeed.tech/tags/phoronix.md>), [phoronix-test-suite](<https://devfeed.tech/tags/phoronix-test-suite.md>), [playback](<https://devfeed.tech/tags/playback.md>), [release](<https://devfeed.tech/tags/release.md>), [ubuntu-benchmarks](<https://devfeed.tech/tags/ubuntu-benchmarks.md>), [ubuntu-hardware](<https://devfeed.tech/tags/ubuntu-hardware.md>), [ui](<https://devfeed.tech/tags/ui.md>)

## AI overview

Firefox 157 Beta adds improved HDR video handling for 8-bit formats, better audio/video synchronization when playback speed changes, and fixes for the vertical tabs sidebar. It also adds CSS support for the @supports at-rule function and the "chain" value for the CSS overscroll-behavior property, alongside Nova UI design work and the return of compact mode.

## Source excerpt

The Firefox release train keeps on rolling. With Firefox 156 released, Firefox 157 is now in beta ahead of the planned release coming up at the end of September...