Firefox 95 Brings Security, Performance, and Efficiency Improvements to Mac

Mozilla has released Firefox 95, featuring a new version of its security sandboxing subsystem called RLBox, and additional performance and efficiency improvements for the macOS version of the web browser.

mozilla firefox banner fixed
According to the release notes, RLBox is a new technology that hardens Firefox against potential security vulnerabilities in third-party libraries.

The sandbox subsystem works by compiling a process in WebAssembly before re-converting it into native code, which restricts its access to system memory and stops it from jumping to unexpected parts of the program, thus limiting its potential for exploiting vulnerabilities.

As Mozilla's Bobby Holley explains:

This technique, which uses WebAssembly to isolate potentially-buggy code, builds on the prototype we shipped last year to Mac and Linux users. Now, we're bringing that technology to all supported Firefox platforms (desktop and mobile), and isolating five different modules: Graphite, Hunspell, Ogg, Expat and Woff2.

Going forward, we can treat these modules as untrusted code, and — assuming we did it right — even a zero-day vulnerability in any of them should pose no threat to Firefox. Accordingly, we’ve updated our bug bounty program to pay researchers for bypassing the sandbox even without a vulnerability in the isolated library.

In other improvements, Firefox 95 reduces CPU usage on macOS during event processing, and reduces the power usage of software decoded video on macOS, especially in fullscreen. This includes streaming sites such as Netflix and Amazon Prime Video.

This version also provides faster content process startup and improves page load performance by speculatively compiling JavaScript ahead of time.

Meanwhile, it's now possible to move the Picture-in-Picture toggle button to the opposite side of the video. Users can find the new context menu option Move Picture-in-Picture Toggle to Left (Right) Side.

Lastly, Mozilla says that Site Isolation is now enabled for all Firefox 95 users to better protect them against side-channel attacks such as Spectre.

Firefox 95 for macOS is available now from the Mozilla website.

Tag: Firefox

Top Rated Comments

Marbles1 Avatar
7 weeks ago
We need more applications to hit version 95. FIREFOX 95 sounds so beautifully retro.
Score: 16 Votes (Like | Disagree)
chucker23n1 Avatar
7 weeks ago

FIREFOX 95 sounds so beautifully retro.
I dig the splash screen, too.



(For real, though, I still think incrementing your major version number every six weeks without consideration of whether your changes are actually major is bad. I can never tell what the current version of Firefox or Chrome or Edge is, nor can I tell when the last time they made major changes was. But I can with Safari, because their version numbers make sense.)

Attachment Image
Score: 9 Votes (Like | Disagree)
MacBH928 Avatar
7 weeks ago
Firefox is seriously good and not slouch as people think . I have it on for like over 100 tabs and its running smooth. Do not let FF go under the radar and support FOSS so corporates do not control you like Google with their Chrome browser.



Still no support for the system's text replacements
a lot of apps do not and I think this is because some Apple limitation, so Apple to be blamed
Score: 8 Votes (Like | Disagree)
Kraszim Avatar
7 weeks ago

I use Firefox as my main browser at home – Chrome at work because of the ability to have separate profiles and switch between them.
Have you seen this?
https://addons.mozilla.org/en-US/firefox/addon/multi-account-containers/
If all you need many profiles for are site logins, this will do it with minimal complexity compared to having multiple profiles. If you need to switch whole profiles you can do it in FF as well with this
https://addons.mozilla.org/en-US/firefox/addon/profile-switcher/
Score: 7 Votes (Like | Disagree)
n0dragon Avatar
7 weeks ago
This new version is especially fast. On my M1 mac it even overtakes Safari to be the fastest on speedometer 2.0.
Score: 6 Votes (Like | Disagree)
ZipZilla Avatar
7 weeks ago
FF is still a great browser and use this along with Brave and Safari - triple threat
Score: 5 Votes (Like | Disagree)

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