Firefox 101.0 and 91.10esr released – with security fixes

Mozilla[German]Mozilla developers have released versions 101.0 and 91.10esr of the Firefox browser on May 31, 2022. These are maintenance updates, which fix bugs critical vulnerabilities.


According to the release notes, the May 31, 2022 update brings the following new features to Firefox 101.0:

  • Reading is now easier with the media query prefers-contrast. The option allows websites to detect whether the user has requested web content to be displayed with a higher (or lower) contrast.
  • All unconfigured MIME types can now be assigned a custom action after the download is complete.
  • Firefox now allows users to use as many microphones as desired at the same time during video conferences. It is possible to switch between microphones at any time (if the conferencing service provider allows this flexibility).

Several bug fixes and new policies have been implemented in the latest version of Firefox. For more information, see the Firefox for Business 101 release notes. There are also some minor new features for developers. 

In addition, the following security fixes (for Firefox 101.0 and also for the and 91.10esr) are rolled out with the update.

Other vulnerabilities rated as medium severity are described here. 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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