Windows apps · Application version · November 28, 2025

Firefox Developer Edition (en-US) 146.0

Firefox Developer Edition (en-US) 146.0, released November 28, 2025, fixes 13 CVEs in Firefox Developer Edition (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Firefox Developer Edition (en-US) is 156.0, which also fixes every one of these CVEs.

Urgent

Superseded. The latest Firefox Developer Edition (en-US) is 156.0, which also fixes every CVE on this page. Install that instead.

CVEs closed

1 rated Critical

Exploited

None reported

Highest CVSS

9.8

Base score, 0 to 10

Highest EPSS

0.0060

48th percentile

Priority of the 13 CVEs

Patch now 0
                                Urgent 1
                                High 12
                                Routine 0

Applies to

Product	Version
Firefox Developer Edition (en-US)	146.0

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Urgent	CVE-2025-14326	Use-after-free in the Audio/Video: GMP component	9.8	0.0046	None reported
High	CVE-2025-14321	Use-after-free in the WebRTC: Signaling component	9.8	0.0060	None reported
High	CVE-2025-14324	JIT miscompilation in the JavaScript Engine: JIT component	9.8	0.0057	None reported
High	CVE-2025-14330	JIT miscompilation in the JavaScript Engine: JIT component	9.8	0.0051	None reported
High	CVE-2025-14333	Memory safety bugs fixed in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146	8.1	0.0044	None reported
High	CVE-2025-14323	Privilege escalation in the DOM: Notifications component	8.8	0.0042	None reported
High	CVE-2025-14328	Privilege escalation in the Netmonitor component	8.8	0.0040	None reported
High	CVE-2025-14329	Privilege escalation in the Netmonitor component	8.8	0.0040	None reported
High	CVE-2025-14327	Spoofing issue in the Downloads Panel component	7.5	0.0038	None reported
High	CVE-2025-14325	JIT miscompilation in the JavaScript Engine: JIT component	7.5	0.0034	None reported
High	CVE-2025-14322	Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component	8.0	0.0034	None reported
High	CVE-2025-14332	Memory safety bugs fixed in Firefox 146 and Thunderbird 146	7.3	0.0031	None reported
High	CVE-2025-14331	Same-origin policy bypass in the Request Handling component	7.5	0.0019	None reported

Other Firefox Developer Edition (en-US) versions with security fixes

Firefox Developer Edition (en-US) 156.0
Firefox Developer Edition (en-US)
Firefox Developer Edition (en-US) 151.0
Firefox Developer Edition (en-US)
Firefox Developer Edition (en-US) 149.0
Firefox Developer Edition (en-US)
Firefox Developer Edition (en-US) 148.0
Firefox Developer Edition (en-US)
Firefox Developer Edition (en-US) 147.0
Firefox Developer Edition (en-US)
Firefox Developer Edition (en-US) 145.0
Firefox Developer Edition (en-US)

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