USN-4978-1: Firefox vulnerabilities

Multiple security issues were discovered in Firefox. If a user were tricked into opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, re-enable camera devices without an additional permission prompt, spoof the browser UI, or execute arbitrary code. (CVE-2021-29959, CVE-2021-29961, CVE-2021-29966, CVE-2021-29967) It was discovered that filenames printed from private browsing mode were incorrectly retained in preferences. A local attacker could potentially exploit this to obtain sensitive information. (CVE-2021-29960)