Firefox Beta (MSIX)

by Mozilla Corporationv148.0.15.0

Last updated Jun 19, 2026

The Firefox release channel below standard and above Developer Edition. Since the MSI and EXE versions of Firefox Beta usually share the same program info as Firefox Standard, this package is the only known way to consistently get Beta.

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Install with winget

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

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

Silent install command for Firefox Beta (MSIX)

Firefox Beta (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 Beta (MSIX) →

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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

medium5.4Patched in wingetCVE-2026-12330affects before 115.37.0, 140.12.0Jun 16, 2026
Incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 140.12, Firefox ESR 115.37, and Thunderbird 140.12.
Vendor advisory
medium5.3Patched in wingetCVE-2026-12329affects before 140.12.0Jun 16, 2026
Memory safety bug fixed in Thunderbird ESR 140.12. This vulnerability was fixed in Firefox ESR 140.12 and Thunderbird 140.12.
Vendor advisory
high8.1Fix in v152.0CVE-2026-12328affects before 115.37.0, 140.12.0, 152.0Jun 16, 2026
Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. 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...
Vendor advisory
high8.1Fix in v152.0.0CVE-2026-12327affects before 115.37.0, 140.12.0, 152.0.0Jun 16, 2026
Memory safety bugs present in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. 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 vulnerabi...
Vendor advisory
high8.1Fix in v152.0.0CVE-2026-12326affects before 152.0.0Jun 16, 2026
Memory safety bugs present in Firefox 151 and Thunderbird 151. 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 152 and Thunderbir...
Vendor advisory
medium6.5Fix in v152.0.0CVE-2026-12325affects before 115.37.0, 140.12.0, 152.0.0Jun 16, 2026
Denial-of-service in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
Vendor advisory
high7.3Fix in v152.0.0CVE-2026-12324affects before 140.12.0, 152.0.0Jun 16, 2026
Incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
Vendor advisory
medium5.4Fix in v152.0.0CVE-2026-12323affects before 152.0.0Jun 16, 2026
Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 152 and Thunderbird 152.
Vendor advisory

Showing 8 of 25. Source: NVD, updated 3h 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? Push the patched version to Intune in one click with Pckgr - automated patching is the only way to keep up.

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Frequently asked questions

How do I install Firefox Beta (MSIX) on Windows?

Open Windows Terminal, PowerShell, or Command Prompt and run: winget install --id Mozilla.Firefox.Beta.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 Beta (MSIX) silently for unattended deployment?

Add --silent and accept the agreements upfront: winget install --id Mozilla.Firefox.Beta.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 Beta (MSIX)?

Firefox Beta (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 Beta (MSIX) via winget?

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

Is Firefox Beta (MSIX) free?

Firefox Beta (MSIX) is distributed under MPL-2.0. Refer to the publisher (https://www.firefox.com/channel/desktop/) for the full license terms - Wingetly itself does not charge for installation.

Does Firefox Beta (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 Beta (MSIX) directly from the publisher.

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

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