This update for MozillaFirefox fixes the following issues:
Update to Firefox Extended Support Release 140.7.0 ESR (bsc#1256340).
- MFSA 2026-03
- CVE-2026-0877: Mitigation bypass in the DOM: Security component
- CVE-2026-0878: Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component
- CVE-2026-0879: Sandbox escape due to incorrect boundary conditions in the Graphics component
- CVE-2026-0880: Sandbox escape due to integer overflow in the Graphics component
- CVE-2026-0882: Use-after-free in the IPC component
- CVE-2025-14327: Spoofing issue in the Downloads Panel component
- CVE-2026-0883: Information disclosure in the Networking component
- CVE-2026-0884: Use-after-free in the JavaScript Engine component
- CVE-2026-0885: Use-after-free in the JavaScript: GC component
- CVE-2026-0886: Incorrect boundary conditions in the Graphics component
- CVE-2026-0887: Clickjacking issue, information disclosure in the PDF Viewer component
- CVE-2026-0890: Spoofing issue in the DOM: Copy-Paste and Drag-Drop component
- CVE-2026-0891: Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147