A mishandled security check when creating a WebSocket in a WebWorker caused the Content Security Policy connect-src header to be ignored. This could lead to connections to restricted origins from inside WebWorkers. This vulnerability affects Firefox < 109, Thunderbird < 102.7, and Firefox ESR < 102.7.
https://www.mozilla.org/security/advisories/mfsa2023-03/
https://www.mozilla.org/security/advisories/mfsa2023-02/