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Note: Downloading Firefox ESR is recommended for screen reader users by the creators of JAWS and NVDA. Firefox ESR is the version that screen reader users should use until Firefox Quantum supports more accessibility features.There are several reasons you may want to use Firefox ESR. This allows users to access tools which are not yet available in Firefox Quantum. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.Firefox Extended Support Release (ESR), currently based on Firefox 52, is a version of Firefox that comes equipped with the newest security and safety improvements, but uses the older version of Firefox for everything else. Depending on the privileges associated with the user an attacker could then install programs view, change, or delete data or create new accounts with full user rights. Successful exploitation of the most severe of these vulnerabilities could allow for remote code execution. Memory safety bugs which could be exploited for arbitrary code execution fixed in Firefox 99 (CVE-2022-28288).Memory safety bugs which could be exploited for arbitrary code execution fixed in Firefox 99 and Firefox ESR 91.8 (CVE-2022-28289).Denial of Service via complex regular expressions (CVE-2022-24713).Text Selection could crash Firefox (CVE-2022-28287).iframe contents could be rendered outside the border (CVE-2022-28286).Incorrect AliasSet used in JIT Codegen (CVE-2022-28285).Script could be executed via svg's use element (CVE-2022-28284).Missing security checks for fetching sourceMapURL (CVE-2022-28283).Use-after-free in DocumentL10n::TranslateDocument (CVE-2022-28282).Use-after-free after VR Process destruction (CVE-2022-1196).Out of bounds write due to unexpected WebAuthN Extensions (CVE-2022-28281).Use-after-free in NSSToken objects(CVE-2022-1097).Details of these vulnerabilities are as follows: Multiple vulnerabilities have been discovered in Mozilla Firefox and Firefox Extended Support Release (ESR), the most severe of which could allow for remote code execution.