This update for MozillaFirefox fixes the following issues:
This update contains the Firefox Extended Support Release 91.1.0 ESR.
MFSA 2021-40 (bsc#1190269, bsc#1190274):
mk:
URL scheme could load Internet ExplorerFirefox 91.0.1esr ESR
Firefox Extended Support Release 91.0 ESR
New: Some of the highlights of the new Extended Support Release are:
Enterprise: Various bug fixes and new policies have been implemented in the latest version of Firefox. See more details in the Firefox for Enterprise 91 Release Notes.
MFSA 2021-33 (bsc#1188891):
CVE-2021-29986: Race condition when resolving DNS names could have led to memory corruption