I just downloaded it and am using it now! I like it so far!
Array.pop . This can allow for an exploitable crash. We are aware of targeted attacks in the wild abusing this flaw."
Outdated again since there is a new Firefox ESR update:
Edit: TB 8.5.3 available (Tor Browser 8.5.3 released, fixes another high-rated security vulnerability (CVE-2019-11708))