Firefox 121.0 – Fast, safe Web browser.

Firefox offers a fast, safe Web browsing experience. Browse quickly, securely, and effortlessly. With its industry-leading features, Firefox is the choice of Web development professionals and casual users alike.

Mozilla Firefox for Mac is a versatile and feature-packed browser with advanced security features that can hide shared user activity and has customizable privacy settings that protect your system from unwanted tracking and harmful software.

Mozilla Firefox is perfect for casual searches as well as more complex queries.

You no longer need an app or extension to take screenshots because when you download Firefox for Mac you get a brand new capture tool that captures any part of a webpage and makes images available for download online.

Faster and Better

Since the release of Quantum is now twice as fast as its predecessors and needs 30% less memory than its main competitor Chrome.

Clean Interface

Firefox interface is intuitive to use with tools and features that are easy to locate.

The dashboard-style homepage offers access to:

Different search bars
Downloads
Bookmarks
History
Synchronization across devices and platforms
Add-ons
Customizable toolbars
Customizable page layouts
Advanced saving options
Brand new screen capturing tool

Features

Facebook container extension – separate activity on Facebook from other web activities.
Enhanced and customizable privacy tracking protection settings could slow down browsing speeds, but protects your privacy.
Protect your computer from malware and harmful software
Lockbox Password manager for password-free login
Firefox Monitor, check, and set alerts for any email breaches.
Run Firefox in Safe Mode
Backup your Firefox Profile
Site optimization for a smooth browsing experience
Tiled history: a tiled display of the sites you’ve visited lately
Session Restore

Support for Developers

Firefox provides an open-source platform for developers to create powerful add-ons and extensions
Add extensions from the Firefox extension workshop to enhance productivity and user experience.
Developer hub where you can port Chrome Extensions with minimal effort.
Author, run, and test extensions with the built-in command-line tool
Automate code tests for your add-on
Test your add-on for compatibility across platforms
Live testing and debugging

Firefox Editions

Beta

The Beta version is unstable, and the platform is still in the testing and development phase and sends data to Firefox about any issues encountered.

Nightly

Be the first to check out the features of the next-generation web browser. Nightly is an unstable testing and development platform and sends data to Mozilla and partners to handle any problems encountered.

Developer Edition

Author, debug and scale with the only browser built exclusively for developers.

TestFlight

Developers in the iOS Developer Program can test Firefox beta version via Apple’s TestFlight program.

Known Issues
Firefox will not start up – check for operating-specific issues
Firefox crashes – check crash signature online to find the error
Firefox runs but is not responsive – check if your profile is locked
No Live Support
Hard to find Bookmarked Pages
Fewer Extensions
Some Websites Work Better in Chrome
Plugins are not updated automatically

New:

Firefox now prompts Windows users to install the Microsoft AV1 Video Extension to enable hardware decoding support for the AV1 video codec from about:support if not already installed.
Firefox now supports Voice Control commands on macOS systems.
On Linux, Firefox now defaults to the Wayland compositor when available instead of XWayland. This brings support for touchpad & touchscreen gestures, swipe-to-nav, per-monitor DPI settings, better graphics performance, and more.
Note that due to Wayland protocol limitations, Picture-in-Picture windows require an extra user interaction (generally right-click on the window) or a shell / desktop-environment tweak. See bug 1621261 for related discussion and tracking, this post for a KDE configuration, and this extension for GNOME.
Firefox can now force links to always be underlined. This option can be enabled in the Browsing section of the Firefox Settings menu.