The updated packages fix several bugs and some security issues:
Sandbox escape through Firefox Sync. (CVE-2019-9812)
Stored passwords in 'Saved Logins' can be copied without master password entry. (CVE-2019-11733)
Memory safety bugs fixed in Firefox 69 and Firefox ESR 68.1. (CVE-2019-11735)
File manipulation and privilege escalation in Mozilla Maintenance Service. (CVE-2019-11736)
Content security policy bypass through hash-based sources in directives. (CVE-2019-11738)
Memory safety bugs fixed in Firefox 69, Firefox ESR 68.1, and Firefox ESR 60.9. (CVE-2019-11740)
Same-origin policy violation with SVG filters and canvas to steal cross-origin images. (CVE-2019-11742)
Cross-origin access to unload event attributes. (CVE-2019-11743)
XSS by breaking out of title and textarea elements using innerHTML. (CVE-2019-11744)
Use-after-free while manipulating video. (CVE-2019-11746)
'Forget about this site' removes sites from pre-loaded HSTS list. (CVE-2019-11747)
Persistence of WebRTC permissions in a third party context. (CVE-2019-11748)
Camera information available without prompting using getUserMedia. (CVE-2019-11749)
Type confusion in Spidermonkey. (CVE-2019-11750)
Malicious code execution through command line parameters. (CVE-2019-11751)
Use-after-free while extracting a key value in IndexedDB. (CVE-2019-11752)
Privilege escalation with Mozilla Maintenance Service in custom Firefox installation location. (CVE-2019-11753)