Repeated calls to the history and location interfaces could have been used to hang the browser. This was addressed by introducing rate-limiting to these API calls. This vulnerability affects Firefox < 83.
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-26963.json"
[ { "events": [ { "introduced": "0" }, { "fixed": "83.0" } ] } ]