Firefox

Firefox is Mozilla’s web browser for desktop and mobile browsing, with automatic tracker blocking, interface customization and cross-device access to browsing data. Firefox 157 adds a refreshed design, compact mode and other browser, media and privacy updates.

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Firefox overview

Firefox is a web browser from Mozilla for browsing websites on desktop and mobile devices. Firefox 157 combines a broad interface refresh with tools for adjusting the browser to different workflows, including themes, wallpapers, an arrangeable homepage and compact toolbar and tab layouts.

The release keeps existing menus, shortcuts and extensions in place while updating the visual treatment of toolbars, the sidebar and browser features. Beyond the design changes, Firefox 157 includes hardware AV1 decoding for WebRTC calls on supported devices, accessibility and media fixes, additional web-platform support, and warnings when encryption keys are configured for recording.

Firefox 157 features

Refreshed interface

Firefox 157 updates the browser's toolbars, sidebar, menus and individual features with a more modern visual system while retaining familiar menus, shortcuts and extensions.

Interface customization

The release includes built-in themes with light and dark variants. The What's New page also highlights wallpapers and a homepage that users can arrange.

Compact mode

Compact mode reduces toolbar and tab spacing, leaving more room for web content. It is intended for smaller screens and split-screen layouts, while an automatic compact option is highlighted for smaller displays.

Video and calling improvements

WebRTC video calls can use hardware AV1 decoding on supported devices, reducing reliance on software decoding. Firefox 157 also fixes several video-orientation, HDR, fullscreen and playback-synchronization issues.

Privacy and control

Firefox blocks trackers automatically and provides controls for privacy and optional AI features. Firefox 157 also warns in the site information panel and Settings if encryption keys have been configured for recording.

Cross-device browsing

Firefox is available across desktop and mobile platforms, with options to import bookmarks, passwords and history and to access tabs, history and passwords across devices.

Who Firefox 157 is for

Personalize a daily browser
Use themes, wallpapers, homepage arrangement and toolbar or tab adjustments to set up a browser that fits a personal desktop workflow.
Maximize limited screen space
Enable compact mode to reduce interface spacing when working on a small display or viewing Firefox beside another application in split screen.
Make browser-based video calls
Use Firefox for WebRTC video calls on compatible devices, where hardware AV1 decoding can handle supported AV1 video through the device rather than software decoding alone.
Switch devices or browsers
Move from another browser by importing bookmarks, passwords and history, then use Firefox across desktop, mobile and tablet to access tabs, history and passwords.
Control privacy and browser assistance
Browse with automatic tracker blocking and choose whether optional AI-related features or Firefox Suggest behavior are enabled in settings.

Pros and Cons

Pros

The release adds substantial interface customization without removing familiar menus, shortcuts or extensions.
Compact mode can provide more room for web content on smaller screens and in split-screen layouts.
Tracker blocking is enabled automatically, without requiring additional setup.
Firefox supports desktop and mobile platforms and provides import and cross-device access options for common browsing data.
AI features are optional, and Firefox provides settings for controlling Firefox Suggest and other browser behavior.

Cons

Firefox 157 is not supported on Windows 8.1 and earlier or macOS 10.14 and earlier; Mozilla recommends Firefox ESR for affected systems where available.
Some release capabilities depend on compatible hardware or device support, such as hardware AV1 decoding for WebRTC.

FAQ

What platforms does Firefox support?

Firefox 157 is a desktop and mobile browser release. Downloads are listed for Windows, macOS, Linux, Android and iOS, with separate Windows and Linux builds available in the release notes.

What is new in Firefox 157?

Firefox 157 introduces a refreshed visual design across toolbars, the sidebar, menus and individual browser features. It also adds built-in light and dark themes and a compact mode.

Can I customize the Firefox interface?

Yes. The release adds light and dark built-in themes, and the What's New page also highlights wallpapers, an arrangeable homepage, and customization of the toolbar and tabs.

Can I bring my existing browsing data to Firefox?

Firefox blocks trackers automatically, and the browser homepage says that bookmarks, passwords and history can be imported when switching to Firefox. Firefox Sync also keeps tabs, history and passwords available across desktop, mobile and tablet, with data encrypted by default.

Are there operating-system limitations?

Firefox 157 is not supported on Windows 8.1 and earlier or macOS 10.14 and earlier. Mozilla directs users on those systems to Firefox ESR where available; the release page also notes that system requirements may vary by build.

Quick Facts

Category: Web browser
Release: Firefox 157.0
Release date: September 29, 2026
Platforms: Windows, macOS, Linux, Android and iOS
Interface options: Light and dark themes, wallpapers, arrangeable homepage and compact mode
Privacy defaults: Automatic tracker blocking

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