Firefox 84.0 released for download

Firefox

Firefox is a fast, full-featured Web browser. It offers great security, privacy, and protection against viruses, spyware, malware, and it can also easily block pop-up windows. The key features that have made Firefox so popular are the simple and effective UI, browser speed and strong security capabilities.

Firefox has complete features for browsing the Internet. It is very reliable and flexible due to its implemented security features, along with customization options. Firefox includes pop-up blocking, tab-browsing, integrated Google search, simplified privacy controls, a streamlined browser window that shows you more of the page than any other browser and a number of additional features that work with you to help you get the most out of your time online.

Firefox 84.0 release notes:

New

Native support for macOS devices built with Apple Silicon CPUs brings dramatic performance improvements over the non-native build that was shipped in Firefox 83: Firefox launches over 2.5 times faster and web apps are now twice as responsive (per the SpeedoMeter 2.0 test). If you are on a new Apple device, follow these steps to upgrade to the latest Firefox.
WebRender rolls out to MacOS Big Sur, Windows devices with Intel Gen 6 GPUs, and Intel laptops running Windows 7 and 8. Additionally we'll ship an accelerated rendering pipeline for Linux/GNOME/X11 users for the first time, ever!
Firefox now uses more modern techniques for allocating shared memory on Linux, improving performance and increasing compatibility with Docker.
Firefox 84 is the final release to support Adobe Flash.

Fixed

Various security fixes

Developer

Developer Information
The Network panel is now able to handle unexpected crashes and render useful debugging details such as a related stack-trace. Users can also easily file a bug report by clicking on the available link to help improve the stability of the tool.
The Accessibility Panel now includes an option for displaying elements in their tabbing order in order to help developers see what elements are focusable when tabbing and in what sequence.

Unresolved

macOS users running on Apple Silicon systems may encounter playback errors on encrypted content if the Rosetta system software is not installed.
macOS users running Cylance antivirus software may see their Firefox installation get corrupted due to being erroneously flagged as malware.