Friday, December 10, 2021

Firefox 95 Review 2021

Mozilla released Firefox 95 on December 7, 2021. This is the eleventh and final major browser update in 2021.

This is the seventh update for the new Proton user-interface which was released in June 2021. In this blog post, I cover some of the notable changes in this new browser update.

In the past couple of years, Mozilla has been releasing updates almost on a monthly basis for the Firefox web browser. However, not all of their updates include major changes and new features.

In this new Firefox 95 release, there are several notable changes to highlight and I will cover some of the key changes in this brief blog post. You will also find a video covering what's new in this new stable release.

First up, Mozilla has introduced RLBox sandboxing technology which is designed to isolate subcomponents, to make the browser more secure. This technique uses WebAssembly to isolate potentially-buggy code and isolates these five modules: Graphite, Hunspell, Ogg, Expat and Woff2.

You can check this detailed blog post by Bobby to learn more.

Secondly, Site Isolation which is a security feature in Firefox that protects users against side-channel attacks such as Spectre. This was being rolled out to users starting in Firefox 94. It is now enabled for all Firefox users.

You can read more about it in this in-depth article by Anny to better understand how Site Isolation works.

Thirdly, an improvement to the Picture-in-Picture mode. You can now move the Picture-in-Picture toggle button to the opposite side of the video by right-clicking on the button and choosing “Move Picture-in-Picture Toggle to Left Side”.

And finally in the Microsoft Store you can now download Firefox, for Windows 10 & Windows 11 operating system. There were also a couple of performance improvements implemented like improved page load performance by speculatively compiling JavaScript ahead of time. Mozilla, also made memory allocator improvements.

So these were some of the notable changes in Firefox 95. You can check the list of detailed changes in the Release Notes. In terms of the Browsermark Benchmark test results, the overall performance of Firefox improved slightly compared to the earlier version. On the other hand, Google Chrome continues to outperform.

Well, that's it for now. Like I said, there were only a few changes in this new browser update. If you have any questions, please leave them in the comments section. Wishing you a Merry Christmas and Happy Holidays. Thanks for stopping by!

CREDITS: Browser Benchmark Tests Performed Using Browsermark from Basemark: | Firefox information and logos used under Creative Commons License Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) | Microsoft, Windows, and the Windows logo are trademarks, or registered trademarks of Microsoft Corporation in the United States and/or other countries | Google and the Google logo are registered trademarks of Google Inc., used with permission | Images and graphics used are public domain via Pixabay unless otherwise mentioned | Other names may be trademarks of their respective owners.


  1. As usual, this is a very helpful post, lots of useful information. I’m just stopping in to say hello and to see what's new with you. And I wanted to let you know I was here. I hope you’re well and everything’s going okay.

    Wishing you a wonderful and prosperous New Year. Be well and Stay Safe, my friend!

    1. Thanks much my dear friend Leona! Always good to see you around. I've been keeping busy, but all is well. I hope you're doing well and staying safe. Wishing you a safe, healthy, and prosperous 2022 as well. Stay blessed!