Firefox 95/91.4.0esr

Mozilla[German]Mozilla developers have released version 95.0.0 with some new features and 91.4.0esr of the Firefox browser with a fix rated High as of December 7, 2021. Thanks to the blog readers for pointing out the updates.


Firefox 95.0.0

According to the release notes, version 95.0.0 brings some new features as well as bug fixes and security fixes. Here's a rough overview of what's new: 

  • RLBox – a new technology that protects Firefox against potential vulnerabilities in third-party libraries – is now enabled on all platforms.
  • Firefox can now be downloaded from the Store for Windows 10 and 11.
  • In macOS and Window Server, CPU usage during event processing by Firefox has been reduced.
  • Power consumption of software-decoded videos on macOS has been reduced, especially in full-screen mode. This includes streaming sites such as Netflix and Amazon Prime Video.
  • To better protect Firefox users from side-channel attacks like Spectre, Site Isolation is now enabled for all Firefox 95 users.

Furthermore, there are bug fixes in the new Firefox, which the developers describe with the following notes:

  • After launching Firefox, users of the JAWS screen reader and ZoomText Magnifier no longer need to switch applications to access Firefox.
  • The status of controls that use the ARIA Switch role is now correctly reported by Mac OS VoiceOver.
  • Launching content processes on macOS will now be faster.
  • Memory allocation improvements have been made.
  • Page loading performance has been improved by speculatively compiling JavaScript in advance.

The developers added a user agent override for, which allows Firefox users to use more call features and have access to huddles. In addition, some vulnerabilities rated high, such as Heap Buffer Overflow, have been fixed in the new version. 

Firefox 91.4.0esr

An update of Firefox 91.4.0esr with one year of long-term support with the same fixed vulnerabilities was also provided in each case.

The new Firefox and the ESR variants can be downloaded from this website for various platforms (the variant is to be selected via the displayed list boxes). 


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