Process isolation bypass using "javascript:" URI links in cross-origin frames. (CVE-2025-4083) Unsafe attribute access during XPath parsing. (CVE-2025-4087) Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. (CVE-2025-4091) Memory safety bug fixed in Firefox ESR 128.10 and Thunderbird 128.10. (CVE-2025-4093)