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Firefox 117.0.1 released
(www.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
Based what was said in the security fix link. I see nothing about a fix.
If you're looking for the details of how it was fixed, you'd need to look elsewhere such as: https://stackdiary.com/critical-vulnerability-in-webp-codec-cve-2023-4863/