Zitat von MITs Forum am 2. Juni 2023, 0:00 Uhr

A compromised web child process could disable web security opening restrictions, leading to a new child process being spawned within the file:// context. Given a reliable exploit primitive, this new process could be exploited again leading to arbitrary file read. This vulnerability affects Firefox < 109.

References
https://bugzilla.mozilla.org/show_bug.cgi?id=1538028
https://www.mozilla.org/security/advisories/mfsa2023-01/