Mozilla Firefox 99.0: The following is new


Mozilla released Firefox 99.0 Stable, Firefox 91.8.0 ESR, and Firefox 99.0 for Android to the public on April 5, 2022. The new version includes security fixes, sandbox strengthening on Linux devices, and support for autofilling and capturing credit card details in Germany and France.

All development channels will also be updated. Firefox Beta and Developer Edition will be updated to version 100.0 and Firefox Nightly will be moved to 101.


  • Firefox 99.0 and Firefox 91.8 ESR contain security fixes.
  • Firefox’s Linux sandbox has been improved in this release.

Download and update Firefox 99.0

Here are the links to the official download repositories.

New features and improvements in Firefox 99.0

Firefox on Linux includes an improved sandbox. The change restricts processes exposed to web content from accessing the X Window System (X11).

Other changes

  • The automatic filling out and recording of credit cards is supported in the new version in Germany and France.
  • The key combination n toggles the narration function in reading mode.
  • Search support with and without diacritics in the PDF viewer.

developer changes

  • navigator.pdfViewerEnabled is now enabled and is the recommended way to determine if a browser supports viewing PDF files inline when navigating to them
  • Firefox now supports the RTCPeerConnection.setConfiguration() method.
  • The Network Information API is disabled by default on all platforms because it “exposes a significant amount of user information that could be used for fingerprinting”.

corporate changes

  • Fixed an issue with Outlook Web Access that caused some fields to not work properly.
  • Fixed the ability to install addons from when install_sources specified a different source in ExtensionSettings.

known problems

Gallery mode in the Zoom web client is accessible in Firefox, but video may not always work with “Gallery mode workrooms”. The problem can be fixed by exiting and re-entering the room.

Security Updates/Fixes

Security updates are released after the web browser‘s official release. You will find the information published here after release.


Firefox 99 is the last major two-digit version of the browser. The next release is Firefox 100, which is scheduled to come out on May 3, 2022. There is a chance that some website functionality could break, for example when websites incorrectly parse Firefox’s user-agent string. System administrators can use the network.http.useragent.forceVersion setting to keep the version in the user agent below 100.

Reviews and news about Firefox extensions

Latest Firefox news and tips

Additional information / sources


Mozilla Firefox 99.0: The following is new

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Mozilla Firefox 99.0: The following is new


Mozilla released Firefox 99.0 Stable, Firefox 91.8.0 ESR, and Firefox 99.0 for Android to the public on April 5, 2022.


Martin Brinkman


Ghacks technology news




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