Firefox Developer Edition (MSIX)

by Mozilla Corporationv148.0.15.0

Last updated Jul 27, 2026

The Firefox release channel below Beta and above Nightly. Get the latest features, fast performance, and the development tools you need to build for the open web using Firefox Browser Developer Edition.

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Install with winget

$ winget install --id Mozilla.Firefox.DeveloperEdition.MSIX --exact --version 148.0.15.0

Run in Command Prompt, PowerShell, or Windows Terminal. Prompts for any agreements.

Silent install command for Firefox Developer Edition (MSIX)

Firefox Developer Edition (MSIX) uses MSIX. The silent install switches are (no switches needed).

One-line silent install (x64)

Add-AppxPackage -Path .\Firefox%20Setup%20148.0b15.msix

See the full silent install reference for Firefox Developer Edition (MSIX) →

Built by Pckgr

For IT teams

Deploy this app to your whole fleet with Pckgr RMM.

App deployment, patching, and remote support in one place. Push this app to every device you manage, keep it patched automatically, and see new CVEs the moment they land. Works with Intune or fully standalone.

Free for up to 5 devices.

Installers · v148.0.15.0

Architecture	Type	Scope	Download
x86	MSIX	-	Direct
x64	MSIX	-	Direct
arm64	MSIX	-	Direct

Copy a command tailored to that specific architecture, type, and scope - useful when winget would otherwise pick a different default.

Security

25 known CVEs via NVD

critical9.8Fix in v153.0.0CVE-2026-16412affects before 140.13.0, 153.0.0Jul 21, 2026
Memory safety bugs present in Firefox ESR 140.12 and Firefox 152. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 153, Firefox ES...
Vendor advisory
critical9.8Fix in v153.0.0CVE-2026-16411affects before 153.0.0Jul 21, 2026
Memory safety bugs present in Firefox 152. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
Vendor advisory
critical9.8Fix in v153.0.0CVE-2026-16410affects before 153.0.0Jul 21, 2026
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
Vendor advisory
high7.5Fix in v153.0.0CVE-2026-16409affects before 153.0.0Jul 21, 2026
Invalid pointer in the Security: PSM component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
Vendor advisory
critical9.8Fix in v153.0.0CVE-2026-16408affects before 153.0.0Jul 21, 2026
Integer overflow in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
Vendor advisory
critical9.8Fix in v153.0.0CVE-2026-16407affects before 153.0.0Jul 21, 2026
Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
Vendor advisory
critical9.1Fix in v153.0.0CVE-2026-16406affects before 153.0.0Jul 21, 2026
Mitigation bypass in the Networking component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
Vendor advisory
high7.5Fix in v153.0.0CVE-2026-16405affects before 140.13.0, 153.0.0Jul 21, 2026
Information disclosure in the Networking: WebSockets component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
Vendor advisory

Showing 8 of 25. Source: NVD, updated 6h ago. Patch status is best-effort: NVD's fix version is compared against the latest version in winget, but the two version formats don't always align. Confirm with the vendor advisory before treating any specific build as safe.

See a CVE that affects your fleet? Pckgr RMM flags vulnerable devices and pushes the patched version automatically - automated patching is the only way to keep up.

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Frequently asked questions

How do I install Firefox Developer Edition (MSIX) on Windows?

Open Windows Terminal, PowerShell, or Command Prompt and run: winget install --id Mozilla.Firefox.DeveloperEdition.MSIX --exact --version 148.0.15.0. winget downloads the installer from Mozilla Corporation and runs it. Requires Windows 10 (1809+) or Windows 11.

How do I install Firefox Developer Edition (MSIX) silently for unattended deployment?

Add --silent and accept the agreements upfront: winget install --id Mozilla.Firefox.DeveloperEdition.MSIX --exact 148.0.15.0 --silent --accept-package-agreements --accept-source-agreements. This is the variant Intune, Configuration Manager, and other deployment tools should use.

What are the silent install switches for Firefox Developer Edition (MSIX)?

Firefox Developer Edition (MSIX) uses MSIX. MSIX packages install silently by default - no switches are needed (Add-AppxPackage -Path .\Firefox%20Setup%20148.0b15.msix).

How do I uninstall Firefox Developer Edition (MSIX) via winget?

Run: winget uninstall --id Mozilla.Firefox.DeveloperEdition.MSIX --exact. Add --silent for unattended uninstalls. winget will use the registered uninstaller from Firefox Developer Edition (MSIX)'s Apps & Features entry.

Is Firefox Developer Edition (MSIX) free?

Firefox Developer Edition (MSIX) is distributed under MPL-2.0. Refer to the publisher (https://www.mozilla.org/firefox/developer/) for the full license terms - Wingetly itself does not charge for installation.

Does Firefox Developer Edition (MSIX) work on Windows 10?

Yes, as long as your Windows 10 build supports winget (1809 or newer). winget ships with App Installer on Windows 10/11 and pulls Firefox Developer Edition (MSIX) directly from the publisher.

How do I keep Firefox Developer Edition (MSIX) up to date?

Run winget upgrade --id Mozilla.Firefox.DeveloperEdition.MSIX --exact, or winget upgrade --all to update everything winget tracks. We index 1 version of Firefox Developer Edition (MSIX) from microsoft/winget-pkgs.