As of September 28, 2023, Mozilla developers have released security updates of Firefox 118.0.1, 118.1.0 and 115.3.1. The updates closed a critical vulnerability (CVE-2023-5217: Heap buffer overflow in libvpx). An overview of the security fixes can be found here (thanks to the reader for the tip).
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Firefox 118.0.2 released Oct. 10:
https://www.deskmodder.de/blog/2023/10/10/firefox-118-0-2-als-neues-update-von-mozilla/
https://www.mozilla.org/en-US/firefox/118.0.2/releasenotes/