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This is not the latest version of Mozilla Firefox available.

Mozilla Firefox


Package test results are passing.

This package was approved as a trusted package on 1/27/2017.

Bringing together all kinds of awesomeness to make browsing better for you.

This package installs Firefox in the first language which matches this list:

  1. Install arguments override parameter if present, e.g. choco install Firefox -packageParameters "l=en-GB".
    To get a list of all available locales have a look at this file:
  2. If Firefox is already installed: the same language as the already installed Firefox.
  3. The Windows system language where the Firefox package gets installed.
  4. If Firefox does not support the system language, it will fall back to “en-US”

Looking for Firefox Developer Edition? Install the firefox-dev package.

To install Mozilla Firefox, run the following command from the command line or from PowerShell:

C:\> choco install firefox --version 51.0.1

To upgrade Mozilla Firefox, run the following command from the command line or from PowerShell:

C:\> choco upgrade firefox --version 51.0.1


  • tools\chocolateyInstall.ps1 Show
    $ErrorActionPreference = 'Stop'
    # This is the general install script for Mozilla products (Firefox and Thunderbird).
    # This file must be identical for all Choco packages for Mozilla products in this repository.
    $toolsPath = Split-Path $MyInvocation.MyCommand.Definition
    . $toolsPath\helpers.ps1
    $packageName = 'Firefox'
    $softwareName = 'Mozilla Firefox'
    $allLocalesListURL = ''
    $alreadyInstalled = (AlreadyInstalled -product $softwareName -version '51.0.1')
    if (Get-32bitOnlyInstalled -product $softwareName) {
      Write-Output $(
        'Detected the 32-bit version of Firefox on a 64-bit system. ' +
        'This package will continue to install the 32-bit version of Firefox ' +
        'unless the 32-bit version is uninstalled.'
    if ($alreadyInstalled) {
      Write-Output $(
        "Firefox is already installed. " +
        'No need to download an re-install again.'
    } else {
      $locale = GetLocale -localeUrl $allLocalesListURL -product $softwareName
      $checksums = GetChecksums -language $locale -checksumFile "$toolsPath\LanguageChecksums"
      $packageArgs = @{
        packageName = $packageName
        fileType = 'exe'
        softwareName = "$softwareName*"
        Checksum = $checksums.Win32
        ChecksumType = 'sha512'
        Url = "${locale}"
        silentArgs = '-ms'
        validExitCodes = @(0)
      if (!(Get-32bitOnlyInstalled($softwareName)) -and (Get-ProcessorBits 64)) {
        $packageArgs.Checksum64 = $checksums.Win64
        $packageArgs.ChecksumType64 = 'sha512'
        $packageArgs.Url64 = "${locale}"
      Install-ChocolateyPackage @packageArgs
  • tools\chocolateyUninstall.ps1 Show
    $ErrorActionPreference = 'Stop';
    $packageName = 'Firefox'
    $uninstalled = $false
    [array]$key = Get-UninstallRegistryKey -SoftwareName 'Mozilla Firefox*'
    if ($key.Count -eq 1) {
      $key | % {
        $packageArgs = @{
          packageName = $packageName
          fileType    = 'exe'
          silentArgs  = '-ms'
          validExitCodes= @(0)
          file          = "$($_.UninstallString.Trim('"'))"
        Uninstall-ChocolateyPackage @packageArgs
        Write-Warning "Auto Uninstaller may detect Mozilla Maintenance Service."
        Write-Warning "This should not be uninstalled if any other Mozilla product is installed."
    } elseif ($key.Count -eq 0) {
      Write-Warning "$packageName has already been uninstalled by other means."
    } elseif ($key.Count -gt 1) {
      Write-Warning "$($key.Count) matches found!"
      Write-Warning "To prevent accidental data loss, no programs will be uninstalled."
      Write-Warning "Please alert package maintainer the following keys were matched:"
      $key | % {Write-Warning "- $($_.DisplayName)"}
  • tools\helpers.ps1 Show
    function GetUninstallPath() {
        [Parameter(Mandatory = $true)]
      $regUninstallDir = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\'
      $regUninstallDirWow64 = 'HKLM:\SOFTWARE\Wow432Node\Microsoft\Windows\CurrentVersion\Uninstall\'
      $uninstallPaths = $(Get-ChildItem $regUninstallDir).Name
      if (Test-Path $regUninstallDirWow64) {
        $uninstallPaths += $(Get-ChildItem $regUninstallDirWow64).Name
      $uninstallPath = $uninstallPaths -match "$product [\d\.]+ \([^\s]+ [a-zA-Z\-]+\)" | select -first 1
      return $uninstallPath
    function GetLocale {
        [Parameter(Mandatory = $true)]
        [Parameter(Mandatory = $true)]
      $availableLocales = Get-WebContent $localeUrl 2>$null
      $packageParameters = $env:chocolateyPackageParameters
      $packageParameters = if ($packageParameters -ne $null) { $packageParameters } else { "" }
      $argumentMap = ConvertFrom-StringData $packageParameters
      $localeFromPackageParameters = $argumentMap.Item('l')
      $uninstallPath = GetUninstallPath -product $product
      $alreadyInstalledLocale = $uninstallPath -replace ".+\s([a-zA-Z\-]+)\)",'$1'
      $systemLocalizeAndCountry = (Get-Culture).Name
      $systemLocaleTwoLetter = (Get-Culture).TwoLetterISOLanguageName
      $fallbackLocale = 'en-US'
      $locales = $localeFromPackageParameters, $alreadyInstalledLocale, `
        $systemLocalizeAndCountry, $systemLocaleTwoLetter, $fallbackLocale
        foreach ($locale in $locales) {
          $localeMatch = $availableLocales -match "os=win&lang=$locale`"" | select -first 1
          if ($localeMatch -and $locale -ne $null) {
        return $locale
    function AlreadyInstalled() {
        [Parameter(Mandatory = $true)]
        [Parameter(Mandatory = $true)]
      $uninstallEntry = $(
        "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\$product $version*"
      $uninstallEntryWow64 = $(
        "HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\$product $version*"
      if ((Test-Path $uninstallEntry) -or (Test-Path $uninstallEntryWow64)) {
        return $true
      return $false
    function Get-32bitOnlyInstalled() {
        [Parameter(Mandatory = $true)]
      $systemIs64bit = Get-ProcessorBits 64
      if (-Not $systemIs64bit) {
        return $false
      $registryPaths = @(
      $installedVersions = Get-ChildItem $registryPaths | ? { $_.Name -match "$product [\d\.]+ \(x(64|86)" }
      if (
        $installedVersions -match 'x86' `
        -and $installedVersions -notmatch 'x64' `
        -and $systemIs64bit
      ) {
        return $true
    function GetChecksums() {
        [Parameter(Mandatory = $true)]
        [Parameter(Mandatory = $true)]
      Write-Debug "Loading checksums from: $checksumFile"
      $checksumContent = Get-Content $checksumFile
      $checksum32 = ($checksumContent -match "$language\|32") -split '\|' | select -last 1
      $checksum64 = ($checksumContent -match "$language\|64") -split '\|' | select -last 1
      return @{
        "Win32" = $checksum32
        "Win64" = $checksum64
  • tools\LanguageChecksums

Virus Scan Results

In cases where actual malware is found, the packages are subject to removal. Software sometimes has false positives. Moderators do not necessarily validate the safety of the underlying software, only that a package retrieves software from the official distribution point and/or validate embedded software against official distribution point (where distribution rights allow redistribution).

Chocolatey Pro provides runtime protection from possible malware.


Package Maintainer(s)

Software Author(s)

  • Mozilla


Release Notes

Version History

Version Downloads Last updated Status
Mozilla Firefox 59.0 46802 Tuesday, March 13, 2018 approved
Mozilla Firefox 58.0.2 272193 Thursday, February 8, 2018 approved
Mozilla Firefox 58.0.1 129630 Monday, January 29, 2018 approved
Mozilla Firefox 58.0 70467 Tuesday, January 23, 2018 approved
Mozilla Firefox 57.0.4 149862 Friday, January 5, 2018 approved
Mozilla Firefox 57.0.3 61558 Thursday, December 28, 2017 approved
Mozilla Firefox 57.0.2 131652 Friday, December 8, 2017 approved
Mozilla Firefox 57.0.1 81028 Thursday, November 30, 2017 approved
Mozilla Firefox 126373 Wednesday, November 15, 2017 approved
Show More

Discussion for the Mozilla Firefox Package

Ground rules:

  • This discussion is only about Mozilla Firefox and the Mozilla Firefox package. If you have feedback for Chocolatey, please contact the google group.
  • This discussion will carry over multiple versions. If you have a comment about a particular version, please note that in your comments.
  • The maintainers of this Chocolatey Package will be notified about new comments that are posted to this Disqus thread, however, it is NOT a guarantee that you will get a response. If you do not hear back from the maintainers after posting a message below, please follow up by using the link on the left side of this page or follow this link to contact maintainers. If you still hear nothing back, please follow the package triage process.
  • Tell us what you love about the package or Mozilla Firefox, or tell us what needs improvement.
  • Share your experiences with the package, or extra configuration or gotchas that you've found.
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