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Mozilla Firefox (MSIX) Nightly

by Mozillav158.2609.1809.0

Last updated

Firefox browser nightly builds

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Install with winget

$ winget install --id Mozilla.Firefox.Nightly.MSIX --exact --version 158.2609.1809.0

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

Silent install command for Mozilla Firefox (MSIX) Nightly

Mozilla Firefox (MSIX) Nightly uses MSIX. The silent install switches are (no switches needed).

One-line silent install (x64)
Add-AppxPackage -Path .\firefox-158.0a1.multi.win64.installer.msix

See the full silent install reference for Mozilla Firefox (MSIX) Nightly →

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About

Firefox is a free and open-source web browser developed by the Mozilla Foundation. Nightly provides the latest development patches and fixes, before they are introduced into other stable versions.

Installers · v158.2609.1809.0

ArchitectureTypeScopeInstallDownload
x86MSIX-Direct
x64MSIX-Direct
arm64MSIX-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

  • high7.5Patched in wingetCVE-2026-84145affects before 115.40.0, 140.15.0, 153.2.0, 155.0.0Sep 1, 2026

    Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vu...

    Vendor advisory
  • high7.5Patched in wingetCVE-2026-84144affects before 153.2.0, 155.0.0Sep 1, 2026

    Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in...

    Vendor advisory
  • critical9.8Patched in wingetCVE-2026-84143affects before 140.15.0, 153.2.0, 155.0.0Sep 1, 2026

    Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vu...

    Vendor advisory
  • critical9.8Patched in wingetCVE-2026-84142affects before 155.0.0Sep 1, 2026

    Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155 and Thunderbi...

    Vendor advisory
  • critical9.8Patched in wingetCVE-2026-84141affects before 153.2.0, 155.0.0Sep 1, 2026

    Integer overflow in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

    Vendor advisory
  • critical9.8Patched in wingetCVE-2026-84140affects before 153.2.0, 155.0.0Sep 1, 2026

    Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

    Vendor advisory
  • medium6.1Patched in wingetCVE-2026-84139affects before 153.2.0, 155.0.0Sep 1, 2026

    Clickjacking issue in the DOM: Events component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

    Vendor advisory
  • medium6.5Patched in wingetCVE-2026-84138affects before 155.0.0Sep 1, 2026

    Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.

    Vendor advisory
Showing 8 of 25. Source: NVD, updated 1h 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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More from Mozilla or browse browser, gecko, internet.

Frequently asked questions

How do I install Mozilla Firefox (MSIX) Nightly on Windows?
Open Windows Terminal, PowerShell, or Command Prompt and run: winget install --id Mozilla.Firefox.Nightly.MSIX --exact --version 158.2609.1809.0. winget downloads the installer from Mozilla and runs it. Requires Windows 10 (1809+) or Windows 11.
How do I install Mozilla Firefox (MSIX) Nightly silently for unattended deployment?
Add --silent and accept the agreements upfront: winget install --id Mozilla.Firefox.Nightly.MSIX --exact 158.2609.1809.0 --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 Mozilla Firefox (MSIX) Nightly?
Mozilla Firefox (MSIX) Nightly uses MSIX. MSIX packages install silently by default - no switches are needed (Add-AppxPackage -Path .\firefox-158.0a1.multi.win64.installer.msix).
How do I uninstall Mozilla Firefox (MSIX) Nightly via winget?
Run: winget uninstall --id Mozilla.Firefox.Nightly.MSIX --exact. Add --silent for unattended uninstalls. winget will use the registered uninstaller from Mozilla Firefox (MSIX) Nightly's Apps & Features entry.
Is Mozilla Firefox (MSIX) Nightly free?
Mozilla Firefox (MSIX) Nightly is distributed under MPL-2.0. Refer to the publisher (https://www.firefox.com/en-US/channel/desktop/?redirect_source=mozilla-org) for the full license terms - Wingetly itself does not charge for installation.
Does Mozilla Firefox (MSIX) Nightly 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 Mozilla Firefox (MSIX) Nightly directly from the publisher.
How do I keep Mozilla Firefox (MSIX) Nightly up to date?
Run winget upgrade --id Mozilla.Firefox.Nightly.MSIX --exact, or winget upgrade --all to update everything winget tracks. We index 10 versions of Mozilla Firefox (MSIX) Nightly from microsoft/winget-pkgs.

Recent versions

  • 158.2609.1809.0latest
  • 158.2609.1120.0
  • 158.2609.1014.0
  • 157.2609.908.0
  • 157.2609.821.0
  • 157.2609.709.0
  • 157.2609.409.0
  • 157.2609.321.0
  • 157.2609.309.0
  • 157.2609.208.0