A service worker can send the activate event on itself periodically which allows it to run perpetually, allowing it to monitor activity by users. Affects all versions prior to Firefox 60.
[ { "events": [ { "introduced": "0" }, { "fixed": "60.0" } ] } ]
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-5179.json"