Fast, Secure, and Customizable: Firefox 84 Portable Review

Firefox 84 Portable Review

Firefox is known for its top-notch browsing tools. It offers a fast, user-friendly interface and takes the upmost care with your privacy.

It’s easy to take your favorite browser and extensions with you on a USB drive. It’s especially useful for those who use public computers, such as in libraries and computer labs.


A fast browser should allow you to organize and prioritize information quickly and effectively, no matter where you work. Syncing bookmarks, tabs, history, passwords, add-ons and settings across multiple computers should be simple and secure. Mozilla’s new browser engine delivers on these features with amazing responsiveness and low memory usage.

Firefox 84 Portable introduces an optimized version of the Quantum engine that runs faster than ever. This includes a new speculative parsing of external JavaScript scripts on page load that improves performance by 3-4% for many sites and reduces layout shift during page load.

We’ve also improved UI responsiveness with better accuracy for touch scrolling, reduced panning jitter, and more consistent text display in menus and dialogs. And we’ve made improvements to WebRender on macOS that reduces power use when scrolling or watching videos. The result is the fastest Firefox experience we’ve ever tested.


Many Firefox features that help you stay organized and productive, like tab browsing, smart bookmarks, add-ons and extensions, work on any computer. However, switching between computers can be frustrating when these tools are not available because they need to be installed on the host machine.

Taking your browser and extensions with you on a portable stick is an easy way to overcome this limitation. You can also keep Firefox from writing to your hard drive by checking the Privacy options to clear the cache on exit.

Enhanced Tracking Protection protects you against websites that collect your settings to create a digital fingerprint and track your browsing across sites. DNS-over-HTTPS provides a secure connection when you write an address in the address bar. Also new is fingerprinting protection to warn you of apps that use your device’s microphone to listen to your conversations. This version includes a few other security fixes. For example, the component directory is locked down to prevent rogue software from silently installing in Firefox.


Firefox is a full-featured web browser that respects your privacy and offers powerful features for controlling how your personal information is shared online. Its security capabilities include anti-virus and malware protection, pop-up blocking and simplified privacy settings. Its streamlined interface is easy to customize with third-party add-ons and multiple Mozilla authored options.

This version of Firefox includes a few important new features, according to Mozilla: a grid view for tabs; the ability to delete downloaded files directly from the app interface; and improved scrolling control and performance, including support for multi-touch gestures on Windows devices. It also fixes issues with some third-party antivirus solutions that cause Firefox to crash.

In addition, this update removes support for older CPU architectures such as PowerPC and ARMv7, although a third-party project has ported Firefox to macOS with Apple Silicon processors, using Firefox 45 ESR. The release notes include helpful details about system requirements. Mozilla has also updated its bug reporting tool to make it easier for users to submit feedback about crashes and other unexpected behavior.


Easily customize Firefox to fit your needs with thousands of add-ons. Add a new look to your browser with a wide selection of themes. Keep track of your Pocket saves, bookmarks, browsing history, downloads, and screenshots in one convenient location. Add a password manager or other security features with free extensions like LastPass, Discord, and uBlock Origin.

In addition to x86, we’re introducing native WebRender support for macOS devices using Apple Silicon CPUs, Windows computers with Intel Gen 6 GPUs, and Linux/GNOME/X11. Firefox will launch faster and web apps will be more responsive on these systems.

Use Portable Firefox to create multiple sandboxed instances of the browser, so you can log into different accounts for the same service in separate windows, run different extensions and styles in each instance, and more. Read how reader Asian Angel uses this feature to assemble a colorful “Firefox six pack” for her work on various projects. Unlike regular installed Firefox, Portable Firefox doesn’t need installation.

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