CVE-2025-6425

CVE-2025-6425 concerns a WebCompat WebExtension issue in Firefox/Thunderbird where enumerating resources could obtain a persistent, browser-identifying UUID that remains across containers and normal/private browsing (not in profiles). Affected: Firefox < 140, Firefox ESR < 115.25, Firefox E...

Mozilla -- persistent UUID that identifies browser

[email protected] reports: An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability affects Firefox 140, Firefox E...