Mozilla’s Firefox 73 and 68.5 releases tackle six high-severity security flaws. Two of the bugs allow a remote attacker to execute code on targeted devices by enticing users to visit a specially-crafted web site and exploiting browser memory corruption flaws. Another flaw (CVE-2020-6799) addresses an error when opening PDF links from other applications (when Firefox is configured as a default PDF reader) Users can download the latest version of Firefox and download it here. Mozilla also notes that users with 0patch software may encounter crashes at startup after the release.
Source: https://threatpost.com/mozilla-firefox-73-browser-update-fixes-high-severity-rce-bugs/152831/