By downloading a file with the .fileloc extension, a semi-privileged extension could launch an arbitrary application on the user's computer. The attacker is restricted as they are unable to download non-quarantined files or supply command line arguments to the application, limiting the impact. Note: this issue only occurs on Mac OSX. Other operating systems are unaffected. This vulnerability affects Thunderbird < 68.5, Firefox < 73, and Firefox < ESR68.5.
https://www.mozilla.org/security/advisories/mfsa2020-07/
https://www.mozilla.org/security/advisories/mfsa2020-06/
https://www.mozilla.org/security/advisories/mfsa2020-05/