Updated firefox packages fix security vulnerabilities:
Mozilla: Memory safety bugs fixed in Firefox ESR 60.3 (CVE-2018-12389).
Mozilla: Memory safety bugs fixed in Firefox 63 and Firefox ESR 60.3 (CVE-2018-12390).
Mozilla: Crash with nested event loops (CVE-2018-12392).
Mozilla: Integer overflow during Unicode conversion while loading JavaScript (CVE-2018-12393).
Mozilla: WebExtension bypass of domain restrictions through header rewriting (CVE-2018-12395).
Mozilla: WebExtension content scripts can execute in disallowed contexts (CVE-2018-12396).
Mozilla: WebExtension local file permission check bypass (CVE-2018-12397).